diff --git a/cache/cache.go b/cache/cache.go
new file mode 100644
index 0000000..d144b8f
--- /dev/null
+++ b/cache/cache.go
@@ -0,0 +1,11 @@
+package cache
+
+import "time"
+
+//Cache interface
+type Cache interface {
+	Get(key string) interface{}
+	Set(key string, val interface{}, timeout time.Duration) error
+	IsExist(key string) bool
+	Delete(key string) error
+}
diff --git a/cache/memcache.go b/cache/memcache.go
new file mode 100644
index 0000000..010b2c6
--- /dev/null
+++ b/cache/memcache.go
@@ -0,0 +1,51 @@
+package cache
+
+import (
+	"errors"
+	"time"
+
+	"github.com/bradfitz/gomemcache/memcache"
+)
+
+//Memcache struct contains *memcache.Client
+type Memcache struct {
+	conn *memcache.Client
+}
+
+//NewMemcache create new memcache
+func NewMemcache(server ...string) *Memcache {
+	mc := memcache.New(server...)
+	return &Memcache{mc}
+}
+
+//Get return cached value
+func (mem *Memcache) Get(key string) interface{} {
+	if item, err := mem.conn.Get(key); err == nil {
+		return string(item.Value)
+	}
+	return nil
+}
+
+// IsExist check value exists in memcache.
+func (mem *Memcache) IsExist(key string) bool {
+	_, err := mem.conn.Get(key)
+	if err != nil {
+		return false
+	}
+	return true
+}
+
+//Set cached value with key and expire time.
+func (mem *Memcache) Set(key string, val interface{}, timeout time.Duration) error {
+	v, ok := val.(string)
+	if !ok {
+		return errors.New("val must string")
+	}
+	item := &memcache.Item{Key: key, Value: []byte(v), Expiration: int32(timeout / time.Second)}
+	return mem.conn.Set(item)
+}
+
+//Delete delete value in memcache.
+func (mem *Memcache) Delete(key string) error {
+	return mem.conn.Delete(key)
+}
diff --git a/cache/memcache_test.go b/cache/memcache_test.go
new file mode 100644
index 0000000..6b4ea02
--- /dev/null
+++ b/cache/memcache_test.go
@@ -0,0 +1,28 @@
+package cache
+
+import (
+	"testing"
+	"time"
+)
+
+func TestMemcache(t *testing.T) {
+	mem := NewMemcache("127.0.0.1:11211")
+	var err error
+	timeoutDuration := 10 * time.Second
+	if err = mem.Set("username", "silenceper", timeoutDuration); err != nil {
+		t.Error("set Error", err)
+	}
+
+	if !mem.IsExist("username") {
+		t.Error("IsExist Error")
+	}
+
+	name := mem.Get("username").(string)
+	if name != "silenceper" {
+		t.Error("get Error")
+	}
+
+	if err = mem.Delete("username"); err != nil {
+		t.Errorf("delete Error , err=%v", err)
+	}
+}
diff --git a/context/access_token.go b/context/access_token.go
new file mode 100644
index 0000000..3b3d263
--- /dev/null
+++ b/context/access_token.go
@@ -0,0 +1,71 @@
+package context
+
+import (
+	"encoding/json"
+	"fmt"
+	"sync"
+	"time"
+
+	"github.com/silenceper/wechat/util"
+)
+
+const (
+	//AccessTokenURL 获取access_token的接口
+	AccessTokenURL = "https://api.weixin.qq.com/cgi-bin/token"
+)
+
+//ResAccessToken struct
+type ResAccessToken struct {
+	util.CommonError
+
+	AccessToken string `json:"access_token"`
+	ExpiresIn   int64  `json:"expires_in"`
+}
+
+//SetAccessTokenLock 设置读写锁（一个appID一个读写锁）
+func (ctx *Context) SetAccessTokenLock(l *sync.RWMutex) {
+	ctx.accessTokenLock = l
+}
+
+//GetAccessToken 获取access_token
+func (ctx *Context) GetAccessToken() (accessToken string, err error) {
+	ctx.accessTokenLock.Lock()
+	defer ctx.accessTokenLock.Unlock()
+
+	accessTokenCacheKey := fmt.Sprintf("access_token_%s", ctx.AppID)
+	val := ctx.Cache.Get(accessTokenCacheKey)
+	if val != nil {
+		accessToken = val.(string)
+		return
+	}
+
+	//从微信服务器获取
+	var resAccessToken ResAccessToken
+	resAccessToken, err = ctx.GetAccessTokenFromServer()
+	if err != nil {
+		return
+	}
+
+	accessToken = resAccessToken.AccessToken
+	return
+}
+
+//GetAccessTokenFromServer 强制从微信服务器获取token
+func (ctx *Context) GetAccessTokenFromServer() (resAccessToken ResAccessToken, err error) {
+	url := fmt.Sprintf("%s?grant_type=client_credential&appid=%s&secret=%s", AccessTokenURL, ctx.AppID, ctx.AppSecret)
+	var body []byte
+	body, err = util.HTTPGet(url)
+	err = json.Unmarshal(body, &resAccessToken)
+	if err != nil {
+		return
+	}
+	if resAccessToken.ErrMsg != "" {
+		err = fmt.Errorf("get access_token error : errcode=%v , errormsg=%v", resAccessToken.ErrCode, resAccessToken.ErrMsg)
+		return
+	}
+
+	accessTokenCacheKey := fmt.Sprintf("access_token_%s", ctx.AppID)
+	expires := resAccessToken.ExpiresIn - 1500
+	err = ctx.Cache.Set(accessTokenCacheKey, resAccessToken.AccessToken, time.Duration(expires)*time.Second)
+	return
+}
diff --git a/context/context.go b/context/context.go
new file mode 100644
index 0000000..ce10617
--- /dev/null
+++ b/context/context.go
@@ -0,0 +1,51 @@
+package context
+
+import (
+	"net/http"
+	"sync"
+
+	"github.com/silenceper/wechat/cache"
+)
+
+//Context struct
+type Context struct {
+	AppID          string
+	AppSecret      string
+	Token          string
+	EncodingAESKey string
+
+	Cache cache.Cache
+
+	Writer  http.ResponseWriter
+	Request *http.Request
+
+	//accessTokenLock 读写锁 同一个AppID一个
+	accessTokenLock *sync.RWMutex
+
+	//jsapiTicket 读写锁 同一个AppID一个
+	jsApiTicketLock *sync.RWMutex
+}
+
+// Query returns the keyed url query value if it exists
+func (ctx *Context) Query(key string) string {
+	value, _ := ctx.GetQuery(key)
+	return value
+}
+
+// GetQuery is like Query(), it returns the keyed url query value
+func (ctx *Context) GetQuery(key string) (string, bool) {
+	req := ctx.Request
+	if values, ok := req.URL.Query()[key]; ok && len(values) > 0 {
+		return values[0], true
+	}
+	return "", false
+}
+
+//SetJsApiTicket 设置jsApiTicket的lock
+func (ctx *Context) SetJsApiTicketLock(lock *sync.RWMutex) {
+	ctx.jsApiTicketLock = lock
+}
+
+func (ctx *Context) GetJsApiTicketLock() *sync.RWMutex {
+	return ctx.jsApiTicketLock
+}
diff --git a/context/render.go b/context/render.go
new file mode 100644
index 0000000..e2fb825
--- /dev/null
+++ b/context/render.go
@@ -0,0 +1,43 @@
+package context
+
+import (
+	"encoding/xml"
+	"net/http"
+)
+
+var xmlContentType = []string{"application/xml; charset=utf-8"}
+var plainContentType = []string{"text/plain; charset=utf-8"}
+
+//Render render from bytes
+func (ctx *Context) Render(bytes []byte) {
+	//debug
+	//fmt.Println("response msg = ", string(bytes))
+	ctx.Writer.WriteHeader(200)
+	_, err := ctx.Writer.Write(bytes)
+	if err != nil {
+		panic(err)
+	}
+}
+
+//String render from string
+func (ctx *Context) String(str string) {
+	writeContextType(ctx.Writer, plainContentType)
+	ctx.Render([]byte(str))
+}
+
+//XML render to xml
+func (ctx *Context) XML(obj interface{}) {
+	writeContextType(ctx.Writer, xmlContentType)
+	bytes, err := xml.Marshal(obj)
+	if err != nil {
+		panic(err)
+	}
+	ctx.Render(bytes)
+}
+
+func writeContextType(w http.ResponseWriter, value []string) {
+	header := w.Header()
+	if val := header["Content-Type"]; len(val) == 0 {
+		header["Content-Type"] = value
+	}
+}
diff --git a/js/js.go b/js/js.go
new file mode 100644
index 0000000..44edae6
--- /dev/null
+++ b/js/js.go
@@ -0,0 +1,109 @@
+package js
+
+import (
+	"encoding/json"
+	"fmt"
+	"time"
+
+	"github.com/silenceper/wechat/context"
+	"github.com/silenceper/wechat/util"
+)
+
+const getTicketURL = "https://api.weixin.qq.com/cgi-bin/ticket/getticket?access_token=%s&type=jsapi"
+
+//Js struct
+type Js struct {
+	*context.Context
+}
+
+//Config 返回给用户jssdk配置信息
+type Config struct {
+	AppID     string
+	TimeStamp int64
+	NonceStr  string
+	Signature string
+}
+
+//resTicket 请求jsapi_tikcet返回结果
+type resTicket struct {
+	util.CommonError
+
+	Ticket    string `json:"ticket"`
+	ExpiresIn int64  `json:"expires_in"`
+}
+
+//NewJs init
+func NewJs(context *context.Context) *Js {
+	js := new(Js)
+	js.Context = context
+	return js
+}
+
+//GetConfig 获取jssdk需要的配置参数
+//uri 为当前网页地址
+func (js *Js) GetConfig(uri string) (config *Config, err error) {
+	config = new(Config)
+	var ticketStr string
+	ticketStr, err = js.getTicket()
+	if err != nil {
+		return
+	}
+
+	nonceStr := util.RandomStr(16)
+	timestamp := util.GetCurrTs()
+	str := fmt.Sprintf("jsapi_ticket=%s&noncestr=%s&timestamp=%d&url=%s", ticketStr, nonceStr, timestamp, uri)
+	sigStr := util.Signature(str)
+
+	config.AppID = js.AppID
+	config.NonceStr = nonceStr
+	config.TimeStamp = timestamp
+	config.Signature = sigStr
+	return
+}
+
+//getTicket 获取jsapi_tocket全局缓存
+func (js *Js) getTicket() (ticketStr string, err error) {
+	js.GetJsApiTicketLock().Lock()
+	defer js.GetJsApiTicketLock().Unlock()
+
+	//先从cache中取
+	jsAPITicketCacheKey := fmt.Sprintf("jsapi_ticket_%s", js.AppID)
+	val := js.Cache.Get(jsAPITicketCacheKey)
+	if val != nil {
+		ticketStr = val.(string)
+		return
+	}
+	var ticket resTicket
+	ticket, err = js.getTicketFromServer()
+	if err != nil {
+		return
+	}
+	ticketStr = ticket.Ticket
+	return
+}
+
+//getTicketFromServer 强制从服务器中获取ticket
+func (js *Js) getTicketFromServer() (ticket resTicket, err error) {
+	var accessToken string
+	accessToken, err = js.GetAccessToken()
+	if err != nil {
+		return
+	}
+
+	var response []byte
+	url := fmt.Sprintf(getTicketURL, accessToken)
+	response, err = util.HTTPGet(url)
+	err = json.Unmarshal(response, &ticket)
+	if err != nil {
+		return
+	}
+	if ticket.ErrCode != 0 {
+		err = fmt.Errorf("getTicket Error : errcode=%s , errmsg=%s", ticket.ErrCode, ticket.ErrMsg)
+		return
+	}
+
+	jsAPITicketCacheKey := fmt.Sprintf("jsapi_ticket_%s", js.AppID)
+	expires := ticket.ExpiresIn - 1500
+	err = js.Cache.Set(jsAPITicketCacheKey, ticket.Ticket, time.Duration(expires)*time.Second)
+	return
+}
diff --git a/material/material.go b/material/material.go
new file mode 100644
index 0000000..60af0e3
--- /dev/null
+++ b/material/material.go
@@ -0,0 +1,167 @@
+package material
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+
+	"github.com/silenceper/wechat/context"
+	"github.com/silenceper/wechat/util"
+)
+
+const (
+	addNewsURL     = "https://api.weixin.qq.com/cgi-bin/material/add_news"
+	addMaterialURL = "https://api.weixin.qq.com/cgi-bin/material/add_material"
+)
+
+//Material 素材管理
+type Material struct {
+	*context.Context
+}
+
+//NewMaterial init
+func NewMaterial(context *context.Context) *Material {
+	material := new(Material)
+	material.Context = context
+	return material
+}
+
+//Article 永久图文素材
+type Article struct {
+	ThumbMediaID     string `json:"thumb_media_id"`
+	Author           string `json:"author"`
+	Digest           string `json:"digest"`
+	ShowCoverPic     int    `json:"show_cover_pic"`
+	Content          string `json:"content"`
+	ContentSourceURL string `json:"content_source_url"`
+}
+
+//reqArticles 永久性图文素材请求信息
+type reqArticles struct {
+	articles []*Article `json:"articles"`
+}
+
+//resArticles 永久性图文素材返回结果
+type resArticles struct {
+	util.CommonError
+
+	MediaID string `json:"media_id"`
+}
+
+//AddNews 新增永久图文素材
+func (material *Material) AddNews(articles []*Article) (mediaID string, err error) {
+	req := &reqArticles{articles}
+
+	var accessToken string
+	accessToken, err = material.GetAccessToken()
+	if err != nil {
+		return
+	}
+
+	uri := fmt.Sprintf("%s?access_token=%s", addNewsURL, accessToken)
+	responseBytes, err := util.PostJSON(uri, req)
+	var res resArticles
+	err = json.Unmarshal(responseBytes, res)
+	if err != nil {
+		return
+	}
+	mediaID = res.MediaID
+	return
+}
+
+//resAddMaterial 永久性素材上传返回的结果
+type resAddMaterial struct {
+	util.CommonError
+
+	MediaID string `json:"media_id"`
+	URL     string `json:"url"`
+}
+
+//AddMaterial 上传永久性素材（处理视频需要单独上传）
+func (material *Material) AddMaterial(mediaType MediaType, filename string) (mediaID string, url string, err error) {
+	if mediaType == MediaTypeVideo {
+		err = errors.New("永久视频素材上传使用 AddVideo 方法")
+	}
+	var accessToken string
+	accessToken, err = material.GetAccessToken()
+	if err != nil {
+		return
+	}
+
+	uri := fmt.Sprintf("%s?access_token=%s&type=%s", addMaterialURL, accessToken, mediaType)
+	var response []byte
+	response, err = util.PostFile("media", filename, uri)
+	if err != nil {
+		return
+	}
+	var resMaterial resAddMaterial
+	err = json.Unmarshal(response, &resMaterial)
+	if err != nil {
+		return
+	}
+	if resMaterial.ErrCode != 0 {
+		err = fmt.Errorf("AddMaterial error : errcode=%v , errmsg=%v", resMaterial.ErrCode, resMaterial.ErrMsg)
+		return
+	}
+	mediaID = resMaterial.MediaID
+	url = resMaterial.URL
+	return
+}
+
+type reqVideo struct {
+	Title        string `json:"title"`
+	Introduction string `json:"introduction"`
+}
+
+//AddVideo 永久视频素材文件上传
+func (material *Material) AddVideo(filename, title, introduction string) (mediaID string, url string, err error) {
+	var accessToken string
+	accessToken, err = material.GetAccessToken()
+	if err != nil {
+		return
+	}
+
+	uri := fmt.Sprintf("%s?access_token=%s&type=video", addMaterialURL, accessToken)
+
+	videoDesc := &reqVideo{
+		Title:        title,
+		Introduction: introduction,
+	}
+	var fieldValue []byte
+	fieldValue, err = json.Marshal(videoDesc)
+	if err != nil {
+		return
+	}
+
+	fields := []util.MultipartFormField{
+		{
+			IsFile:    true,
+			Fieldname: "video",
+			Filename:  filename,
+		},
+		{
+			IsFile:    true,
+			Fieldname: "description",
+			Value:     fieldValue,
+		},
+	}
+
+	var response []byte
+	response, err = util.PostMultipartForm(fields, uri)
+	if err != nil {
+		return
+	}
+
+	var resMaterial resAddMaterial
+	err = json.Unmarshal(response, &resMaterial)
+	if err != nil {
+		return
+	}
+	if resMaterial.ErrCode != 0 {
+		err = fmt.Errorf("AddMaterial error : errcode=%v , errmsg=%v", resMaterial.ErrCode, resMaterial.ErrMsg)
+		return
+	}
+	mediaID = resMaterial.MediaID
+	url = resMaterial.URL
+	return
+}
diff --git a/material/media.go b/material/media.go
new file mode 100644
index 0000000..aca5f92
--- /dev/null
+++ b/material/media.go
@@ -0,0 +1,109 @@
+package material
+
+import (
+	"encoding/json"
+	"fmt"
+
+	"github.com/silenceper/wechat/util"
+)
+
+//MediaType 媒体文件类型
+type MediaType string
+
+const (
+	//MediaTypeImage 媒体文件:图片
+	MediaTypeImage MediaType = "image"
+	//MediaTypeVoice 媒体文件:声音
+	MediaTypeVoice = "voice"
+	//MediaTypeVideo 媒体文件:视频
+	MediaTypeVideo = "video"
+	//MediaTypeThumb 媒体文件:缩略图
+	MediaTypeThumb = "thumb"
+)
+
+const (
+	mediaUploadURL      = "https://api.weixin.qq.com/cgi-bin/media/upload"
+	mediaUploadImageURL = "https://api.weixin.qq.com/cgi-bin/media/uploadimg"
+	mediaGetURL         = "https://api.weixin.qq.com/cgi-bin/media/get"
+)
+
+//Media 临时素材上传返回信息
+type Media struct {
+	util.CommonError
+
+	Type      MediaType `json:"type"`
+	MediaID   string    `json:"media_id"`
+	CreatedAt int64     `json:"created_at"`
+}
+
+//MediaUpload 临时素材上传
+func (material *Material) MediaUpload(mediaType MediaType, filename string) (media Media, err error) {
+	var accessToken string
+	accessToken, err = material.GetAccessToken()
+	if err != nil {
+		return
+	}
+
+	uri := fmt.Sprintf("%s?access_token=%s&type=%s", mediaUploadURL, accessToken, mediaType)
+	var response []byte
+	response, err = util.PostFile("media", filename, uri)
+	if err != nil {
+		return
+	}
+	err = json.Unmarshal(response, &media)
+	if err != nil {
+		return
+	}
+	if media.ErrCode != 0 {
+		err = fmt.Errorf("MediaUpload error : errcode=%v , errmsg=%v", media.ErrCode, media.ErrMsg)
+		return
+	}
+	return
+}
+
+//GetMediaURL 返回临时素材的下载地址供用户自己处理
+//NOTICE: URL 不可公开，因为含access_token 需要立即另存文件
+func (material *Material) GetMediaURL(mediaID string) (mediaURL string, err error) {
+	var accessToken string
+	accessToken, err = material.GetAccessToken()
+	if err != nil {
+		return
+	}
+	mediaURL = fmt.Sprintf("%s?access_token=%s&media_id=%s", mediaGetURL, accessToken, mediaID)
+	return
+}
+
+//resMediaImage 图片上传返回结果
+type resMediaImage struct {
+	util.CommonError
+
+	URL string `json:"url"`
+}
+
+//ImageUpload 图片上传
+func (material *Material) ImageUpload(filename string) (url string, err error) {
+	var accessToken string
+	accessToken, err = material.GetAccessToken()
+	if err != nil {
+		return
+	}
+
+	uri := fmt.Sprintf("%s?access_token=%s", mediaUploadImageURL, accessToken)
+	var response []byte
+	response, err = util.PostFile("media", filename, uri)
+	if err != nil {
+		return
+	}
+	var image resMediaImage
+	err = json.Unmarshal(response, &image)
+	if err != nil {
+		return
+	}
+	if image.ErrCode != 0 {
+		err = fmt.Errorf("UploadImage error : errcode=%v , errmsg=%v", image.ErrCode, image.ErrMsg)
+		return
+	}
+	url = image.URL
+	return
+
+}
diff --git a/message/image.go b/message/image.go
new file mode 100644
index 0000000..93e6bc0
--- /dev/null
+++ b/message/image.go
@@ -0,0 +1,17 @@
+package message
+
+//Image 图片消息
+type Image struct {
+	CommonToken
+
+	Image struct {
+		MediaID string `xml:"MediaId"`
+	} `xml:"Image"`
+}
+
+//NewImage 回复图片消息
+func NewImage(mediaID string) *Image {
+	image := new(Image)
+	image.Image.MediaID = mediaID
+	return image
+}
diff --git a/message/message.go b/message/message.go
new file mode 100644
index 0000000..b64b0e3
--- /dev/null
+++ b/message/message.go
@@ -0,0 +1,120 @@
+package message
+
+import "encoding/xml"
+
+//MsgType 基本消息类型
+type MsgType string
+
+//EventType 事件类型
+type EventType string
+
+const (
+	//MsgTypeText 表示文本消息
+	MsgTypeText MsgType = "text"
+	//MsgTypeImage 表示图片消息
+	MsgTypeImage = "image"
+	//MsgTypeVoice 表示语音消息
+	MsgTypeVoice = "voice"
+	//MsgTypeVideo 表示视频消息
+	MsgTypeVideo = "video"
+	//MsgTypeShortVideo 表示短视频消息[限接收]
+	MsgTypeShortVideo = "shortvideo"
+	//MsgTypeLocation 表示坐标消息[限接收]
+	MsgTypeLocation = "location"
+	//MsgTypeLink 表示链接消息[限接收]
+	MsgTypeLink = "link"
+	//MsgTypeMusic 表示音乐消息[限回复]
+	MsgTypeMusic = "music"
+	//MsgTypeNews 表示图文消息[限回复]
+	MsgTypeNews = "news"
+	//MsgTypeTransfer 表示消息消息转发到客服
+	MsgTypeTransfer = "transfer_customer_service"
+)
+
+const (
+	//EventSubscribe 订阅
+	EventSubscribe EventType = "subscribe"
+	//EventUnsubscribe 取消订阅
+	EventUnsubscribe EventType = "unsubscribe"
+	//EventScan 用户已经关注公众号，则微信会将带场景值扫描事件推送给开发者
+	EventScan EventType = "SCAN"
+	//EventLocation 上报地理位置事件
+	EventLocation EventType = "LOCATION"
+	//EventClick 点击菜单拉取消息时的事件推送
+	EventClick EventType = "CLICK"
+	//EventView 点击菜单跳转链接时的事件推送
+	EventView EventType = "VIEW"
+)
+
+//MixMessage 存放所有微信发送过来的消息和事件
+type MixMessage struct {
+	CommonToken
+
+	//基本消息
+	MsgID        int64   `xml:"MsgId"`
+	Content      string  `xml:"Content"`
+	PicURL       string  `xml:"PicUrl"`
+	MediaID      string  `xml:"MediaId"`
+	Format       string  `xml:"Format"`
+	ThumbMediaID string  `xml:"ThumbMediaId"`
+	LocationX    float64 `xml:"Location_X"`
+	LocationY    float64 `xml:"Location_Y"`
+	Scale        float64 `xml:"Scale"`
+	Label        string  `xml:"Label"`
+	Title        string  `xml:"Title"`
+	Description  string  `xml:"Description"`
+	URL          string  `xml:"Url"`
+
+	//事件相关
+	Event     string `xml:"Event"`
+	EventKey  string `xml:"EventKey"`
+	Ticket    string `xml:"Ticket"`
+	Latitude  string `xml:"Latitude"`
+	Longitude string `xml:"Longitude"`
+	Precision string `xml:"Precision"`
+}
+
+//EncryptedXMLMsg 安全模式下的消息体
+type EncryptedXMLMsg struct {
+	XMLName      struct{} `xml:"xml" json:"-"`
+	ToUserName   string   `xml:"ToUserName" json:"ToUserName"`
+	EncryptedMsg string   `xml:"Encrypt"    json:"Encrypt"`
+}
+
+//ResponseEncryptedXMLMsg 需要返回的消息体
+type ResponseEncryptedXMLMsg struct {
+	XMLName      struct{} `xml:"xml" json:"-"`
+	EncryptedMsg string   `xml:"Encrypt"      json:"Encrypt"`
+	MsgSignature string   `xml:"MsgSignature" json:"MsgSignature"`
+	Timestamp    int64    `xml:"TimeStamp"    json:"TimeStamp"`
+	Nonce        string   `xml:"Nonce"        json:"Nonce"`
+}
+
+// CommonToken 消息中通用的结构
+type CommonToken struct {
+	XMLName      xml.Name `xml:"xml"`
+	ToUserName   string   `xml:"ToUserName"`
+	FromUserName string   `xml:"FromUserName"`
+	CreateTime   int64    `xml:"CreateTime"`
+	MsgType      MsgType  `xml:"MsgType"`
+}
+
+//SetToUserName set ToUserName
+func (msg *CommonToken) SetToUserName(toUserName string) {
+	msg.ToUserName = toUserName
+}
+
+//SetFromUserName set FromUserName
+func (msg *CommonToken) SetFromUserName(fromUserName string) {
+	msg.FromUserName = fromUserName
+}
+
+//SetCreateTime set createTime
+func (msg *CommonToken) SetCreateTime(createTime int64) {
+	msg.CreateTime = createTime
+}
+
+//SetMsgType set MsgType
+func (msg *CommonToken) SetMsgType(msgType MsgType) {
+	msg.MsgType = msgType
+}
diff --git a/message/music.go b/message/music.go
new file mode 100644
index 0000000..3e010ed
--- /dev/null
+++ b/message/music.go
@@ -0,0 +1,24 @@
+package message
+
+//Music 音乐消息
+type Music struct {
+	CommonToken
+
+	Music struct {
+		Title        string `xml:"Title"        `
+		Description  string `xml:"Description"  `
+		MusicURL     string `xml:"MusicUrl"     `
+		HQMusicURL   string `xml:"HQMusicUrl"   `
+		ThumbMediaID string `xml:"ThumbMediaId"`
+	} `xml:"Music"`
+}
+
+//NewMusic  回复音乐消息
+func NewMusic(title, description, musicURL, hQMusicURL, thumbMediaID string) *Music {
+	music := new(Music)
+	music.Music.Title = title
+	music.Music.Description = description
+	music.Music.MusicURL = musicURL
+	music.Music.ThumbMediaID = thumbMediaID
+	return music
+}
diff --git a/message/news.go b/message/news.go
new file mode 100644
index 0000000..ee28b0c
--- /dev/null
+++ b/message/news.go
@@ -0,0 +1,35 @@
+package message
+
+//News 图文消息
+type News struct {
+	CommonToken
+
+	ArticleCount int        `xml:"ArticleCount"`
+	Articles     []*Article `xml:"Articles>item,omitempty"`
+}
+
+//NewNews 初始化图文消息
+func NewNews(articles []*Article) *News {
+	news := new(News)
+	news.ArticleCount = len(articles)
+	news.Articles = articles
+	return news
+}
+
+//Article 单篇文章
+type Article struct {
+	Title       string `xml:"Title,omitempty"`
+	Description string `xml:"Description,omitempty"`
+	PicURL      string `xml:"PicUrl,omitempty"`
+	URL         string `xml:"Url,omitempty"`
+}
+
+//NewArticle 初始化文章
+func NewArticle(title, description, picURL, url string) *Article {
+	article := new(Article)
+	article.Title = title
+	article.Description = description
+	article.PicURL = picURL
+	article.URL = url
+	return article
+}
diff --git a/message/reply.go b/message/reply.go
new file mode 100644
index 0000000..53592f0
--- /dev/null
+++ b/message/reply.go
@@ -0,0 +1,15 @@
+package message
+
+import "errors"
+
+//ErrInvalidReply 无效的回复
+var ErrInvalidReply = errors.New("无效的回复消息")
+
+//ErrUnsupportReply 不支持的回复类型
+var ErrUnsupportReply = errors.New("不支持的回复消息")
+
+//Reply 消息回复
+type Reply struct {
+	MsgType MsgType
+	MsgData interface{}
+}
diff --git a/message/text.go b/message/text.go
new file mode 100644
index 0000000..d981d96
--- /dev/null
+++ b/message/text.go
@@ -0,0 +1,14 @@
+package message
+
+//Text 文本消息
+type Text struct {
+	CommonToken
+	Content string `xml:"Content"`
+}
+
+//NewText 初始化文本消息
+func NewText(content string) *Text {
+	text := new(Text)
+	text.Content = content
+	return text
+}
diff --git a/message/video.go b/message/video.go
new file mode 100644
index 0000000..a082065
--- /dev/null
+++ b/message/video.go
@@ -0,0 +1,21 @@
+package message
+
+//Video 视频消息
+type Video struct {
+	CommonToken
+
+	Video struct {
+		MediaID     string `xml:"MediaId"`
+		Title       string `xml:"Title,omitempty"`
+		Description string `xml:"Description,omitempty"`
+	} `xml:"Video"`
+}
+
+//NewVideo 回复图片消息
+func NewVideo(mediaID, title, description string) *Video {
+	video := new(Video)
+	video.Video.MediaID = mediaID
+	video.Video.Title = title
+	video.Video.Description = description
+	return video
+}
diff --git a/message/voice.go b/message/voice.go
new file mode 100644
index 0000000..d76985c
--- /dev/null
+++ b/message/voice.go
@@ -0,0 +1,17 @@
+package message
+
+//Voice 语音消息
+type Voice struct {
+	CommonToken
+
+	Voice struct {
+		MediaID string `xml:"MediaId"`
+	} `xml:"Voice"`
+}
+
+//NewVoice 回复语音消息
+func NewVoice(mediaID string) *Voice {
+	voice := new(Voice)
+	voice.Voice.MediaID = mediaID
+	return voice
+}
diff --git a/oauth/oauth.go b/oauth/oauth.go
new file mode 100644
index 0000000..27fe17a
--- /dev/null
+++ b/oauth/oauth.go
@@ -0,0 +1,152 @@
+package oauth
+
+import (
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"net/url"
+
+	"github.com/silenceper/wechat/context"
+	"github.com/silenceper/wechat/util"
+)
+
+const (
+	redirectOauthURL      = "https://open.weixin.qq.com/connect/oauth2/authorize?appid=%s&redirect_uri=%s&response_type=code&scope=%s&state=%s#wechat_redirect"
+	accessTokenURL        = "https://api.weixin.qq.com/sns/oauth2/access_token?appid=%s&secret=%s&code=%s&grant_type=authorization_code"
+	refreshAccessTokenURL = "https://api.weixin.qq.com/sns/oauth2/refresh_token?appid=%s&grant_type=refresh_token&refresh_token=%s"
+	userInfoURL           = "https://api.weixin.qq.com/sns/userinfo?access_token=%s&openid=%s&lang=zh_CN"
+	checkAccessTokenURL   = "https://api.weixin.qq.com/sns/auth?access_token=%s&openid=%s"
+)
+
+//Oauth 保存用户授权信息
+type Oauth struct {
+	*context.Context
+}
+
+//NewOauth 实例化授权信息
+func NewOauth(context *context.Context) *Oauth {
+	auth := new(Oauth)
+	auth.Context = context
+	return auth
+}
+
+//GetRedirectURL 获取跳转的url地址
+func (oauth *Oauth) GetRedirectURL(redirectURI, scope, state string) (string, error) {
+	//url encode
+	urlStr := url.QueryEscape(redirectURI)
+	return fmt.Sprintf(redirectOauthURL, oauth.AppID, urlStr, scope, state), nil
+}
+
+//Redirect 跳转到网页授权
+func (oauth *Oauth) Redirect(redirectURI, scope, state string) error {
+	location, err := oauth.GetRedirectURL(redirectURI, scope, state)
+	if err != nil {
+		return err
+	}
+	http.Redirect(oauth.Writer, oauth.Request, location, 302)
+	return nil
+}
+
+// ResAccessToken 获取用户授权access_token的返回结果
+type ResAccessToken struct {
+	util.CommonError
+
+	AccessToken  string `json:"access_token"`
+	ExpiresIn    int64  `json:"expires_in"`
+	RefreshToken string `json:"refresh_token"`
+	OpenID       string `json:"openid"`
+	Scope        string `json:"scope"`
+}
+
+// GetUserAccessToken 通过网页授权的code 换取access_token(区别于context中的access_token)
+func (oauth *Oauth) GetUserAccessToken(code string) (result ResAccessToken, err error) {
+	urlStr := fmt.Sprintf(accessTokenURL, oauth.AppID, oauth.AppSecret, code)
+	var response []byte
+	response, err = util.HTTPGet(urlStr)
+	if err != nil {
+		return
+	}
+	err = json.Unmarshal(response, &result)
+	if err != nil {
+		return
+	}
+	if result.ErrCode != 0 {
+		err = fmt.Errorf("GetUserAccessToken error : errcode=%v , errmsg=%v", result.ErrCode, result.ErrMsg)
+		return
+	}
+	return
+}
+
+//RefreshAccessToken 刷新access_token
+func (oauth *Oauth) RefreshAccessToken(refreshToken string) (result ResAccessToken, err error) {
+	urlStr := fmt.Sprintf(refreshAccessTokenURL, oauth.AppID, refreshToken)
+	var response []byte
+	response, err = util.HTTPGet(urlStr)
+	if err != nil {
+		return
+	}
+	err = json.Unmarshal(response, &result)
+	if err != nil {
+		return
+	}
+	if result.ErrCode != 0 {
+		err = fmt.Errorf("GetUserAccessToken error : errcode=%v , errmsg=%v", result.ErrCode, result.ErrMsg)
+		return
+	}
+	return
+}
+
+//CheckAccessToken 检验access_token是否有效
+func (oauth *Oauth) CheckAccessToken(accessToken, openID string) (b bool, err error) {
+	urlStr := fmt.Sprintf(checkAccessTokenURL, accessToken, openID)
+	var response []byte
+	response, err = util.HTTPGet(urlStr)
+	if err != nil {
+		return
+	}
+	var result util.CommonError
+	err = json.Unmarshal(response, &result)
+	if err != nil {
+		return
+	}
+	if result.ErrCode != 0 {
+		b = false
+		return
+	}
+	b = true
+	return
+}
+
+//UserInfo 用户授权获取到用户信息
+type UserInfo struct {
+	util.CommonError
+
+	OpenID     string   `json:"openid"`
+	Nickname   string   `json:"nickname"`
+	Sex        int32    `json:"sex"`
+	Province   string   `json:"province"`
+	City       string   `json:"city"`
+	Country    string   `json:"country"`
+	HeadImgURL string   `json:"headimgurl"`
+	Privilege  []string `json:"privilege"`
+	Unionid    string   `json:"unionid"`
+}
+
+//GetUserInfo 如果scope为 snsapi_userinfo 则可以通过此方法获取到用户基本信息
+func (oauth *Oauth) GetUserInfo(accessToken, openID string) (result UserInfo, err error) {
+	urlStr := fmt.Sprintf(userInfoURL, accessToken, openID)
+	var response []byte
+	response, err = util.HTTPGet(urlStr)
+	if err != nil {
+		return
+	}
+	err = json.Unmarshal(response, &result)
+	if err != nil {
+		return
+	}
+	if result.ErrCode != 0 {
+		err = fmt.Errorf("GetUserInfo error : errcode=%v , errmsg=%v", result.ErrCode, result.ErrMsg)
+		return
+	}
+	return
+}
diff --git a/server/server.go b/server/server.go
new file mode 100644
index 0000000..8e6b882
--- /dev/null
+++ b/server/server.go
@@ -0,0 +1,233 @@
+package server
+
+import (
+	"encoding/xml"
+	"errors"
+	"fmt"
+	"io/ioutil"
+	"reflect"
+	"runtime/debug"
+	"strconv"
+	"strings"
+
+	"github.com/silenceper/wechat/context"
+	"github.com/silenceper/wechat/message"
+	"github.com/silenceper/wechat/util"
+)
+
+//Server struct
+type Server struct {
+	*context.Context
+
+	openID string
+
+	messageHandler func(message.MixMessage) *message.Reply
+
+	requestRawXMLMsg  []byte
+	requestMsg        message.MixMessage
+	responseRawXMLMsg []byte
+	responseMsg       interface{}
+
+	isSafeMode bool
+	random     []byte
+	nonce      string
+	timestamp  int64
+}
+
+//NewServer init
+func NewServer(context *context.Context) *Server {
+	srv := new(Server)
+	srv.Context = context
+	return srv
+}
+
+//Serve 处理微信的请求消息
+func (srv *Server) Serve() error {
+	if !srv.Validate() {
+		return fmt.Errorf("请求校验失败")
+	}
+
+	echostr, exists := srv.GetQuery("echostr")
+	if exists {
+		srv.String(echostr)
+		return nil
+	}
+
+	response, err := srv.handleRequest()
+	if err != nil {
+		return err
+	}
+
+	//debug
+	//fmt.Println("request msg = ", string(srv.requestRawXMLMsg))
+
+	return srv.buildResponse(response)
+}
+
+//Validate 校验请求是否合法
+func (srv *Server) Validate() bool {
+	timestamp := srv.Query("timestamp")
+	nonce := srv.Query("nonce")
+	signature := srv.Query("signature")
+	return signature == util.Signature(srv.Token, timestamp, nonce)
+}
+
+//HandleRequest 处理微信的请求
+func (srv *Server) handleRequest() (reply *message.Reply, err error) {
+	//set isSafeMode
+	srv.isSafeMode = false
+	encryptType := srv.Query("encrypt_type")
+	if encryptType == "aes" {
+		srv.isSafeMode = true
+	}
+
+	//set openID
+	srv.openID = srv.Query("openid")
+
+	var msg interface{}
+	msg, err = srv.getMessage()
+	if err != nil {
+		return
+	}
+	mixMessage, success := msg.(message.MixMessage)
+	if !success {
+		err = errors.New("消息类型转换失败")
+	}
+	srv.requestMsg = mixMessage
+	reply = srv.messageHandler(mixMessage)
+	return
+}
+
+//GetOpenID return openID
+func (srv *Server) GetOpenID() string {
+	return srv.openID
+}
+
+//getMessage 解析微信返回的消息
+func (srv *Server) getMessage() (interface{}, error) {
+	var rawXMLMsgBytes []byte
+	var err error
+	if srv.isSafeMode {
+		var encryptedXMLMsg message.EncryptedXMLMsg
+		if err := xml.NewDecoder(srv.Request.Body).Decode(&encryptedXMLMsg); err != nil {
+			return nil, fmt.Errorf("从body中解析xml失败,err=%v", err)
+		}
+
+		//验证消息签名
+		timestamp := srv.Query("timestamp")
+		srv.timestamp, err = strconv.ParseInt(timestamp, 10, 32)
+		if err != nil {
+			return nil, err
+		}
+		nonce := srv.Query("nonce")
+		srv.nonce = nonce
+		msgSignature := srv.Query("msg_signature")
+		msgSignatureGen := util.Signature(srv.Token, timestamp, nonce, encryptedXMLMsg.EncryptedMsg)
+		if msgSignature != msgSignatureGen {
+			return nil, fmt.Errorf("消息不合法，验证签名失败")
+		}
+
+		//解密
+		srv.random, rawXMLMsgBytes, err = util.DecryptMsg(srv.AppID, encryptedXMLMsg.EncryptedMsg, srv.EncodingAESKey)
+		if err != nil {
+			return nil, fmt.Errorf("消息解密失败, err=%v", err)
+		}
+	} else {
+		rawXMLMsgBytes, err = ioutil.ReadAll(srv.Request.Body)
+		if err != nil {
+			return nil, fmt.Errorf("从body中解析xml失败, err=%v", err)
+		}
+	}
+
+	srv.requestRawXMLMsg = rawXMLMsgBytes
+
+	return srv.parseRequestMessage(rawXMLMsgBytes)
+}
+
+func (srv *Server) parseRequestMessage(rawXMLMsgBytes []byte) (msg message.MixMessage, err error) {
+	msg = message.MixMessage{}
+	err = xml.Unmarshal(rawXMLMsgBytes, &msg)
+	return
+}
+
+//SetMessageHandler 设置用户自定义的回调方法
+func (srv *Server) SetMessageHandler(handler func(message.MixMessage) *message.Reply) {
+	srv.messageHandler = handler
+}
+
+func (srv *Server) buildResponse(reply *message.Reply) (err error) {
+	defer func() {
+		if e := recover(); e != nil {
+			err = fmt.Errorf("panic error: %v\n%s", e, debug.Stack())
+		}
+	}()
+	if reply == nil {
+		//do nothing
+		return nil
+	}
+	msgType := reply.MsgType
+	switch msgType {
+	case message.MsgTypeText:
+	case message.MsgTypeImage:
+	case message.MsgTypeVoice:
+	case message.MsgTypeVideo:
+	case message.MsgTypeMusic:
+	case message.MsgTypeNews:
+	case message.MsgTypeTransfer:
+	default:
+		err = message.ErrUnsupportReply
+		return
+	}
+
+	msgData := reply.MsgData
+	value := reflect.ValueOf(msgData)
+	//msgData must be a ptr
+	kind := value.Kind().String()
+	if 0 != strings.Compare("ptr", kind) {
+		return message.ErrUnsupportReply
+	}
+
+	params := make([]reflect.Value, 1)
+	params[0] = reflect.ValueOf(srv.requestMsg.FromUserName)
+	value.MethodByName("SetToUserName").Call(params)
+
+	params[0] = reflect.ValueOf(srv.requestMsg.ToUserName)
+	value.MethodByName("SetFromUserName").Call(params)
+
+	params[0] = reflect.ValueOf(msgType)
+	value.MethodByName("SetMsgType").Call(params)
+
+	params[0] = reflect.ValueOf(util.GetCurrTs())
+	value.MethodByName("SetCreateTime").Call(params)
+
+	srv.responseMsg = msgData
+	srv.responseRawXMLMsg, err = xml.Marshal(msgData)
+	return
+}
+
+//Send 将自定义的消息发送
+func (srv *Server) Send() (err error) {
+	replyMsg := srv.responseMsg
+	if srv.isSafeMode {
+		//安全模式下对消息进行加密
+		var encryptedMsg []byte
+		encryptedMsg, err = util.EncryptMsg(srv.random, srv.responseRawXMLMsg, srv.AppID, srv.EncodingAESKey)
+		if err != nil {
+			return
+		}
+		//TODO 如果获取不到timestamp nonce 则自己生成
+		timestamp := srv.timestamp
+		timestampStr := strconv.FormatInt(timestamp, 10)
+		msgSignature := util.Signature(srv.Token, timestampStr, srv.nonce, string(encryptedMsg))
+		replyMsg = message.ResponseEncryptedXMLMsg{
+			EncryptedMsg: string(encryptedMsg),
+			MsgSignature: msgSignature,
+			Timestamp:    timestamp,
+			Nonce:        srv.nonce,
+		}
+	}
+	if replyMsg != nil {
+		srv.XML(replyMsg)
+	}
+	return
+}
diff --git a/util/crypto.go b/util/crypto.go
new file mode 100644
index 0000000..1ec7a4f
--- /dev/null
+++ b/util/crypto.go
@@ -0,0 +1,183 @@
+package util
+
+import (
+	"crypto/aes"
+	"crypto/cipher"
+	"encoding/base64"
+	"fmt"
+)
+
+//EncryptMsg 加密消息
+func EncryptMsg(random, rawXMLMsg []byte, appID, aesKey string) (encrtptMsg []byte, err error) {
+	defer func() {
+		if e := recover(); e != nil {
+			err = fmt.Errorf("panic error: err=%v", e)
+			return
+		}
+	}()
+	var key []byte
+	key, err = aesKeyDecode(aesKey)
+	if err != nil {
+		panic(err)
+	}
+	ciphertext := AESEncryptMsg(random, rawXMLMsg, appID, key)
+	encrtptMsg = []byte(base64.StdEncoding.EncodeToString(ciphertext))
+	return
+}
+
+//AESEncryptMsg ciphertext = AES_Encrypt[random(16B) + msg_len(4B) + rawXMLMsg + appId]
+//参考：github.com/chanxuehong/wechat.v2
+func AESEncryptMsg(random, rawXMLMsg []byte, appID string, aesKey []byte) (ciphertext []byte) {
+	const (
+		BlockSize = 32            // PKCS#7
+		BlockMask = BlockSize - 1 // BLOCK_SIZE 为 2^n 时, 可以用 mask 获取针对 BLOCK_SIZE 的余数
+	)
+
+	appIDOffset := 20 + len(rawXMLMsg)
+	contentLen := appIDOffset + len(appID)
+	amountToPad := BlockSize - contentLen&BlockMask
+	plaintextLen := contentLen + amountToPad
+
+	plaintext := make([]byte, plaintextLen)
+
+	// 拼接
+	copy(plaintext[:16], random)
+	encodeNetworkByteOrder(plaintext[16:20], uint32(len(rawXMLMsg)))
+	copy(plaintext[20:], rawXMLMsg)
+	copy(plaintext[appIDOffset:], appID)
+
+	// PKCS#7 补位
+	for i := contentLen; i < plaintextLen; i++ {
+		plaintext[i] = byte(amountToPad)
+	}
+
+	// 加密
+	block, err := aes.NewCipher(aesKey[:])
+	if err != nil {
+		panic(err)
+	}
+	mode := cipher.NewCBCEncrypter(block, aesKey[:16])
+	mode.CryptBlocks(plaintext, plaintext)
+
+	ciphertext = plaintext
+	return
+}
+
+//DecryptMsg 消息解密
+func DecryptMsg(appID, encryptedMsg, aesKey string) (random, rawMsgXMLBytes []byte, err error) {
+	defer func() {
+		if e := recover(); e != nil {
+			err = fmt.Errorf("panic error: err=%v", e)
+			return
+		}
+	}()
+	var encryptedMsgBytes, key, getAppIDBytes []byte
+	encryptedMsgBytes, err = base64.StdEncoding.DecodeString(encryptedMsg)
+	if err != nil {
+		return
+	}
+	key, err = aesKeyDecode(aesKey)
+	if err != nil {
+		panic(err)
+	}
+	random, rawMsgXMLBytes, getAppIDBytes, err = AESDecryptMsg(encryptedMsgBytes, key)
+	if err != nil {
+		err = fmt.Errorf("消息解密失败,%v", err)
+		return
+	}
+	if appID != string(getAppIDBytes) {
+		err = fmt.Errorf("消息解密校验APPID失败")
+		return
+	}
+	return
+}
+
+func aesKeyDecode(encodedAESKey string) (key []byte, err error) {
+	if len(encodedAESKey) != 43 {
+		err = fmt.Errorf("the length of encodedAESKey must be equal to 43")
+		return
+	}
+	key, err = base64.StdEncoding.DecodeString(encodedAESKey + "=")
+	if err != nil {
+		return
+	}
+	if len(key) != 32 {
+		err = fmt.Errorf("encodingAESKey invalid")
+		return
+	}
+	return
+}
+
+// AESDecryptMsg ciphertext = AES_Encrypt[random(16B) + msg_len(4B) + rawXMLMsg + appId]
+//参考：github.com/chanxuehong/wechat.v2
+func AESDecryptMsg(ciphertext []byte, aesKey []byte) (random, rawXMLMsg, appID []byte, err error) {
+	const (
+		BlockSize = 32            // PKCS#7
+		BlockMask = BlockSize - 1 // BLOCK_SIZE 为 2^n 时, 可以用 mask 获取针对 BLOCK_SIZE 的余数
+	)
+
+	if len(ciphertext) < BlockSize {
+		err = fmt.Errorf("the length of ciphertext too short: %d", len(ciphertext))
+		return
+	}
+	if len(ciphertext)&BlockMask != 0 {
+		err = fmt.Errorf("ciphertext is not a multiple of the block size, the length is %d", len(ciphertext))
+		return
+	}
+
+	plaintext := make([]byte, len(ciphertext)) // len(plaintext) >= BLOCK_SIZE
+
+	// 解密
+	block, err := aes.NewCipher(aesKey)
+	if err != nil {
+		panic(err)
+	}
+	mode := cipher.NewCBCDecrypter(block, aesKey[:16])
+	mode.CryptBlocks(plaintext, ciphertext)
+
+	// PKCS#7 去除补位
+	amountToPad := int(plaintext[len(plaintext)-1])
+	if amountToPad < 1 || amountToPad > BlockSize {
+		err = fmt.Errorf("the amount to pad is incorrect: %d", amountToPad)
+		return
+	}
+	plaintext = plaintext[:len(plaintext)-amountToPad]
+
+	// 反拼接
+	// len(plaintext) == 16+4+len(rawXMLMsg)+len(appId)
+	if len(plaintext) <= 20 {
+		err = fmt.Errorf("plaintext too short, the length is %d", len(plaintext))
+		return
+	}
+	rawXMLMsgLen := int(decodeNetworkByteOrder(plaintext[16:20]))
+	if rawXMLMsgLen < 0 {
+		err = fmt.Errorf("incorrect msg length: %d", rawXMLMsgLen)
+		return
+	}
+	appIDOffset := 20 + rawXMLMsgLen
+	if len(plaintext) <= appIDOffset {
+		err = fmt.Errorf("msg length too large: %d", rawXMLMsgLen)
+		return
+	}
+
+	random = plaintext[:16:20]
+	rawXMLMsg = plaintext[20:appIDOffset:appIDOffset]
+	appID = plaintext[appIDOffset:]
+	return
+}
+
+// 把整数 n 格式化成 4 字节的网络字节序
+func encodeNetworkByteOrder(orderBytes []byte, n uint32) {
+	orderBytes[0] = byte(n >> 24)
+	orderBytes[1] = byte(n >> 16)
+	orderBytes[2] = byte(n >> 8)
+	orderBytes[3] = byte(n)
+}
+
+// 从 4 字节的网络字节序里解析出整数
+func decodeNetworkByteOrder(orderBytes []byte) (n uint32) {
+	return uint32(orderBytes[0])<<24 |
+		uint32(orderBytes[1])<<16 |
+		uint32(orderBytes[2])<<8 |
+		uint32(orderBytes[3])
+}
diff --git a/util/error.go b/util/error.go
new file mode 100644
index 0000000..b8f4211
--- /dev/null
+++ b/util/error.go
@@ -0,0 +1,6 @@
+package util
+
+type CommonError struct {
+	ErrCode int64  `json:"errcode"`
+	ErrMsg  string `json:"errmsg"`
+}
diff --git a/util/http.go b/util/http.go
new file mode 100644
index 0000000..b4f195d
--- /dev/null
+++ b/util/http.go
@@ -0,0 +1,154 @@
+package util
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"mime/multipart"
+	"net/http"
+	"os"
+)
+
+//HTTPGet get 请求
+func HTTPGet(uri string) ([]byte, error) {
+	response, err := http.Get(uri)
+	if err != nil {
+		return nil, err
+	}
+
+	defer response.Body.Close()
+	if response.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("http get error : uri=%v , statusCode=%v", uri, response.StatusCode)
+	}
+	return ioutil.ReadAll(response.Body)
+}
+
+//PostJSON post json 数据请求
+func PostJSON(uri string, obj interface{}) ([]byte, error) {
+	jsonData, err := json.Marshal(obj)
+	if err != nil {
+		return nil, err
+	}
+	body := bytes.NewBuffer(jsonData)
+	response, err := http.Post(uri, "application/json;charset=utf-8", body)
+	if err != nil {
+		return nil, err
+	}
+	defer response.Body.Close()
+
+	if response.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("http get error : uri=%v , statusCode=%v", uri, response.StatusCode)
+	}
+	return ioutil.ReadAll(response.Body)
+}
+
+//PostFile 上传文件
+func PostFile(fieldname, filename, uri string) ([]byte, error) {
+	/*
+		bodyBuf := &bytes.Buffer{}
+		bodyWriter := multipart.NewWriter(bodyBuf)
+
+		fileWriter, err := bodyWriter.CreateFormFile(fieldname, filename)
+		if err != nil {
+			return nil, fmt.Errorf("error writing to buffer")
+		}
+
+		fh, err := os.Open(filename)
+		if err != nil {
+			return nil, fmt.Errorf("error opening file")
+		}
+		defer fh.Close()
+
+		_, err = io.Copy(fileWriter, fh)
+		if err != nil {
+			return nil, err
+		}
+
+		contentType := bodyWriter.FormDataContentType()
+		bodyWriter.Close()
+
+		resp, err := http.Post(uri, contentType, bodyBuf)
+		if err != nil {
+			return nil, err
+		}
+		defer resp.Body.Close()
+		if resp.StatusCode != http.StatusOK {
+			return nil, err
+		}
+		respBody, err := ioutil.ReadAll(resp.Body)
+		if err != nil {
+			return nil, err
+		}
+		return respBody, nil
+	*/
+	fields := []MultipartFormField{
+		{
+			IsFile:    true,
+			Fieldname: fieldname,
+			Filename:  filename,
+		},
+	}
+	return PostMultipartForm(fields, uri)
+}
+
+//MultipartFormField 保存文件或其他字段信息
+type MultipartFormField struct {
+	IsFile    bool
+	Fieldname string
+	Value     []byte
+	Filename  string
+}
+
+//PostMultipartForm 上传文件或其他多个字段
+func PostMultipartForm(fields []MultipartFormField, uri string) (respBody []byte, err error) {
+	bodyBuf := &bytes.Buffer{}
+	bodyWriter := multipart.NewWriter(bodyBuf)
+
+	for _, field := range fields {
+		if field.IsFile {
+			fileWriter, e := bodyWriter.CreateFormFile(field.Fieldname, field.Filename)
+			if e != nil {
+				err = fmt.Errorf("error writing to buffer , err=%v", e)
+				return
+			}
+
+			fh, e := os.Open(field.Filename)
+			if e != nil {
+				err = fmt.Errorf("error opening file , err=%v", e)
+				return
+			}
+			defer fh.Close()
+
+			if _, err = io.Copy(fileWriter, fh); err != nil {
+				return
+			}
+		} else {
+			partWriter, e := bodyWriter.CreateFormField(field.Fieldname)
+			if e != nil {
+				err = e
+				return
+			}
+			valueReader := bytes.NewReader(field.Value)
+			if _, err = io.Copy(partWriter, valueReader); err != nil {
+				return
+			}
+		}
+	}
+
+	contentType := bodyWriter.FormDataContentType()
+	bodyWriter.Close()
+
+	resp, e := http.Post(uri, contentType, bodyBuf)
+	if e != nil {
+		err = e
+		return
+	}
+	defer resp.Body.Close()
+	if resp.StatusCode != http.StatusOK {
+		return nil, err
+	}
+	respBody, err = ioutil.ReadAll(resp.Body)
+	return
+}
diff --git a/util/signature.go b/util/signature.go
new file mode 100644
index 0000000..a65ee23
--- /dev/null
+++ b/util/signature.go
@@ -0,0 +1,18 @@
+package util
+
+import (
+	"crypto/sha1"
+	"fmt"
+	"io"
+	"sort"
+)
+
+//Signature sha1签名
+func Signature(params ...string) string {
+	sort.Strings(params)
+	h := sha1.New()
+	for _, s := range params {
+		io.WriteString(h, s)
+	}
+	return fmt.Sprintf("%x", h.Sum(nil))
+}
diff --git a/util/signature_test.go b/util/signature_test.go
new file mode 100644
index 0000000..9aa2f7f
--- /dev/null
+++ b/util/signature_test.go
@@ -0,0 +1,11 @@
+package util
+
+import "testing"
+
+func TestSignature(t *testing.T) {
+	//abc sig
+	abc := "a9993e364706816aba3e25717850c26c9cd0d89d"
+	if abc != Signature("a", "b", "c") {
+		t.Error("test Signature Error")
+	}
+}
diff --git a/util/string.go b/util/string.go
new file mode 100644
index 0000000..62b5c13
--- /dev/null
+++ b/util/string.go
@@ -0,0 +1,18 @@
+package util
+
+import (
+	"math/rand"
+	"time"
+)
+
+//RandomStr 随机生成字符串
+func RandomStr(length int) string {
+	str := "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+	bytes := []byte(str)
+	result := []byte{}
+	r := rand.New(rand.NewSource(time.Now().UnixNano()))
+	for i := 0; i < length; i++ {
+		result = append(result, bytes[r.Intn(len(bytes))])
+	}
+	return string(result)
+}
diff --git a/util/time.go b/util/time.go
new file mode 100644
index 0000000..024839c
--- /dev/null
+++ b/util/time.go
@@ -0,0 +1,8 @@
+package util
+
+import "time"
+
+//GetCurrTs return current timestamps
+func GetCurrTs() int64 {
+	return time.Now().Unix()
+}
diff --git a/wechat.go b/wechat.go
new file mode 100644
index 0000000..48f207e
--- /dev/null
+++ b/wechat.go
@@ -0,0 +1,70 @@
+package wechat
+
+import (
+	"net/http"
+	"sync"
+
+	"github.com/silenceper/wechat/cache"
+	"github.com/silenceper/wechat/context"
+	"github.com/silenceper/wechat/js"
+	"github.com/silenceper/wechat/material"
+	"github.com/silenceper/wechat/oauth"
+	"github.com/silenceper/wechat/server"
+)
+
+//Wechat struct
+type Wechat struct {
+	Context *context.Context
+}
+
+//Config for user
+type Config struct {
+	AppID          string
+	AppSecret      string
+	Token          string
+	EncodingAESKey string
+	Cache          cache.Cache
+}
+
+//NewWechat init
+func NewWechat(cfg *Config) *Wechat {
+	context := new(context.Context)
+	copyConfigToContext(cfg, context)
+	return &Wechat{context}
+}
+
+func copyConfigToContext(cfg *Config, context *context.Context) {
+	context.AppID = cfg.AppID
+	context.AppSecret = cfg.AppSecret
+	context.Token = cfg.Token
+	context.EncodingAESKey = cfg.EncodingAESKey
+	context.Cache = cfg.Cache
+	context.SetAccessTokenLock(new(sync.RWMutex))
+	context.SetJsApiTicketLock(new(sync.RWMutex))
+}
+
+//GetServer init
+func (wc *Wechat) GetServer(req *http.Request, writer http.ResponseWriter) *server.Server {
+	wc.Context.Request = req
+	wc.Context.Writer = writer
+	return server.NewServer(wc.Context)
+}
+
+//GetMaterial init
+func (wc *Wechat) GetMaterial() *material.Material {
+	return material.NewMaterial(wc.Context)
+}
+
+//GetOauth init
+func (wc *Wechat) GetOauth(req *http.Request, writer http.ResponseWriter) *oauth.Oauth {
+	wc.Context.Request = req
+	wc.Context.Writer = writer
+	return oauth.NewOauth(wc.Context)
+}
+
+//GetJs init
+func (wc *Wechat) GetJs(req *http.Request, writer http.ResponseWriter) *js.Js {
+	wc.Context.Request = req
+	wc.Context.Writer = writer
+	return js.NewJs(wc.Context)
+}