diff --git a/work/externalcontact/add_msg_template.go b/work/externalcontact/add_msg_template.go
new file mode 100644
index 0000000..cbb0d3f
--- /dev/null
+++ b/work/externalcontact/add_msg_template.go
@@ -0,0 +1,90 @@
+package externalcontact
+
+import (
+	"encoding/json"
+	"fmt"
+	"github.com/silenceper/wechat/v2/util"
+)
+
+const (
+	addMsgTemplateUrl = "https://qyapi.weixin.qq.com/cgi-bin/externalcontact/add_msg_template"
+)
+
+type ChatType string
+
+const (
+	ChatTypeSingle ChatType = "single"
+	ChatTypeGroup  ChatType = "group"
+)
+
+//ReqMessage 企业群发参数
+type ReqMessage struct {
+	ChatType       ChatType `json:"chat_type"`       //群发任务的类型，默认为single，表示发送给客户，group表示发送给客户群
+	ExternalUserid []string `json:"external_userid"` // 客户的外部联系人id列表，仅在chat_type为single时有效，不可与sender同时为空，最多可传入1万个客户
+	Sender         string   `json:"sender"`          //发送企业群发消息的成员userid，当类型为发送给客户群时必填
+	Text           struct {
+		Content string `json:"content"`
+	} `json:"text"`
+	Attachments []struct {
+		Msgtype     string         `json:"msgtype"`
+		Image       MsgImage       `json:"image"`
+		Link        MsgLink        `json:"link"`
+		Miniprogram MsgMiniprogram `json:"miniprogram"`
+		Video       MsgVideo       `json:"video"`
+		File        MsgFile        `json:"file"`
+	} `json:"attachments"`
+}
+type MsgImage struct {
+	MediaId string `json:"media_id"`
+	PicUrl  string `json:"pic_url"`
+}
+type MsgLink struct {
+	Title  string `json:"title"`
+	Picurl string `json:"picurl"`
+	Desc   string `json:"desc"`
+	Url    string `json:"url"`
+}
+type MsgMiniprogram struct {
+	Title      string `json:"title"`
+	PicMediaId string `json:"pic_media_id"`
+	Appid      string `json:"appid"`
+	Page       string `json:"page"`
+}
+type MsgVideo struct {
+	MediaId string `json:"media_id"`
+}
+type MsgFile struct {
+	MediaId string `json:"media_id"`
+}
+
+type resTemplateSend struct {
+	util.CommonError
+	FailList string `json:"fail_list"`
+	MsgID    int64  `json:"msgid"`
+}
+
+//Send 发送应用消息
+func (tpl *Client) Send(msg *ReqMessage) (msgID int64, err error) {
+	var accessToken string
+	accessToken, err = tpl.ctx.GetAccessToken()
+	if err != nil {
+		return
+	}
+	uri := fmt.Sprintf("%s?access_token=%s", addMsgTemplateUrl, accessToken)
+	var response []byte
+	response, err = util.PostJSON(uri, msg)
+	if err != nil {
+		return
+	}
+	var result resTemplateSend
+	err = json.Unmarshal(response, &result)
+	if err != nil {
+		return
+	}
+	if result.ErrCode != 0 {
+		err = fmt.Errorf("template msg send error : errcode=%v , errmsg=%v", result.ErrCode, result.ErrMsg)
+		return
+	}
+	msgID = result.MsgID
+	return
+}
diff --git a/work/externalcontact/client.go b/work/externalcontact/client.go
new file mode 100644
index 0000000..8574317
--- /dev/null
+++ b/work/externalcontact/client.go
@@ -0,0 +1,44 @@
+package externalcontact
+
+import (
+	"errors"
+	"github.com/silenceper/wechat/v2/cache"
+	"github.com/silenceper/wechat/v2/credential"
+	"github.com/silenceper/wechat/v2/work/config"
+	"github.com/silenceper/wechat/v2/work/context"
+)
+
+// Client 企业微信客户联系实例
+type Client struct {
+	corpID         string // 企业ID：企业开通的每个微信客服，都对应唯一的企业ID，企业可在微信客服管理后台的企业信息处查看
+	secret         string // Secret是微信客服用于校验开发者身份的访问密钥，企业成功注册微信客服后，可在「微信客服管理后台-开发配置」处获取
+	token          string // 用于生成签名校验回调请求的合法性
+	encodingAESKey string // 回调消息加解密参数是AES密钥的Base64编码，用于解密回调消息内容对应的密文
+	cache          cache.Cache
+	ctx            *context.Context
+}
+
+// NewClient 初始化企业微信客户联系实例
+func NewClient(cfg *config.Config) (client *Client, err error) {
+	if cfg.Cache == nil {
+		return nil, errors.New("SDK初始化失败")
+	}
+
+	//初始化 AccessToken Handle
+	defaultAkHandle := credential.NewWorkAccessToken(cfg.CorpID, cfg.CorpSecret, credential.CacheKeyWorkPrefix, cfg.Cache)
+	ctx := &context.Context{
+		Config:            cfg,
+		AccessTokenHandle: defaultAkHandle,
+	}
+
+	client = &Client{
+		corpID:         cfg.CorpID,
+		secret:         cfg.CorpSecret,
+		token:          cfg.Token,
+		encodingAESKey: cfg.EncodingAESKey,
+		cache:          cfg.Cache,
+		ctx:            ctx,
+	}
+
+	return client, nil
+}
diff --git a/work/externalcontact/user.go b/work/externalcontact/user.go
new file mode 100644
index 0000000..c4fd2c1
--- /dev/null
+++ b/work/externalcontact/user.go
@@ -0,0 +1,211 @@
+package externalcontact
+
+import (
+	"encoding/json"
+	"fmt"
+	"github.com/silenceper/wechat/v2/util"
+)
+
+const (
+	listUrl           = "https://qyapi.weixin.qq.com/cgi-bin/externalcontact/list"
+	getUrl            = "https://qyapi.weixin.qq.com/cgi-bin/externalcontact/get"
+	getByUserBatchUrl = "https://qyapi.weixin.qq.com/cgi-bin/externalcontact/batch/get_by_user"
+)
+
+type ReqGetByUser struct {
+	UseridList []string `json:"userid_list"`
+	Cursor     string   `json:"cursor"`
+	Limit      int      `json:"limit"`
+}
+type OneUser struct {
+	util.CommonError
+	ExternalContact ExternalContact `json:"external_contact"`
+	FollowUser      []FollowInfo    `json:"follow_user"` //注意，仅获取单个客户详情的时候这里返回的是跟进记录列表
+	NextCursor      string          `json:"next_cursor"`
+}
+type resUserList struct {
+	util.CommonError
+	ExternalContactList []UserInfo `json:"external_contact_list"`
+	NextCursor          string     `json:"next_cursor"`
+}
+type resUserids struct {
+	util.CommonError
+	ExternalUserid []string `json:"external_userid"`
+}
+
+type UserInfo struct {
+	ExternalContact ExternalContact `json:"external_contact"`
+	FollowInfo      FollowInfo      `json:"follow_info"` //企业成员客户跟进信息，可以参考获取客户详情，但标签信息只会返回企业标签和规则组标签的tag_id，个人标签将不再返回
+}
+
+type ExternalContact struct {
+	ExternalUserid  string `json:"external_userid"`
+	Name            string `json:"name"`
+	Position        string `json:"position"`
+	Avatar          string `json:"avatar"`
+	CorpName        string `json:"corp_name"`
+	CorpFullName    string `json:"corp_full_name"`
+	Type            int    `json:"type"`
+	Gender          int    `json:"gender"`
+	Unionid         string `json:"unionid"`
+	ExternalProfile struct {
+		ExternalAttr []struct {
+			Type int    `json:"type"`
+			Name string `json:"name"`
+			Text struct {
+				Value string `json:"value"`
+			} `json:"text,omitempty"`
+			Web struct {
+				Url   string `json:"url"`
+				Title string `json:"title"`
+			} `json:"web,omitempty"`
+			Miniprogram struct {
+				Appid    string `json:"appid"`
+				Pagepath string `json:"pagepath"`
+				Title    string `json:"title"`
+			} `json:"miniprogram,omitempty"`
+		} `json:"external_attr"`
+	} `json:"external_profile,omitempty"`
+}
+
+type FollowInfo struct {
+	Userid      string   `json:"userid"`
+	Remark      string   `json:"remark"`
+	Description string   `json:"description"`
+	Createtime  int      `json:"createtime"`
+	TagId       []string `json:"tag_id"` //批量获取时才有
+	Tags        []struct {
+		GroupName string `json:"group_name"`
+		TagName   string `json:"tag_name"`
+		TagId     string `json:"tag_id,omitempty"`
+		Type      int    `json:"type"`
+	} `json:"tags,omitempty"` //单独获取时才有
+	RemarkCorpName string   `json:"remark_corp_name,omitempty"`
+	RemarkMobiles  []string `json:"remark_mobiles,omitempty"`
+	OperUserid     string   `json:"oper_userid"`
+	AddWay         int      `json:"add_way"`
+	State          string   `json:"state,omitempty"`
+}
+
+//GetUseridList 获取我的客户列表
+func (tpl *Client) GetUseridList(myUserid string) (externalUserid []string, err error) {
+	var accessToken string
+	accessToken, err = tpl.ctx.GetAccessToken()
+	if err != nil {
+		return
+	}
+	uri := fmt.Sprintf("%s?access_token=%s&userid=%s", listUrl, accessToken, myUserid)
+	var response []byte
+	response, err = util.HTTPGet(uri)
+	if err != nil {
+		return
+	}
+	var result resUserids
+	err = json.Unmarshal(response, &result)
+	if err != nil {
+		return
+	}
+	if result.ErrCode != 0 {
+		err = fmt.Errorf("template msg send error : errcode=%v , errmsg=%v", result.ErrCode, result.ErrMsg)
+		return
+	}
+	externalUserid = result.ExternalUserid
+	return
+}
+
+//GetUseridList 获取我的全部客户列表及详情
+func (tpl *Client) GetQyUserInfoList(qyUserid []string) ([]UserInfo, error) {
+	var userInfoList []UserInfo
+	var req ReqGetByUser
+	req.UseridList = qyUserid
+	req.Limit = 100
+	for {
+		userInfoPage, resCursor, err := tpl.GetUserInfoListByUserIds(req)
+		if err != nil {
+			return userInfoList, err
+		}
+		userInfoList = append(userInfoList, userInfoPage...)
+		if resCursor != "" {
+			req.Cursor = resCursor
+		} else {
+			break
+		}
+	}
+	return userInfoList, nil
+}
+
+//GetUserInfoAndAllFollow 获取客户详情以及全部跟进记录
+func (tpl *Client) GetUserInfoAndAllFollow(userid string) (OneUser, error) {
+	var result, res OneUser
+	var err error
+	var cursor string
+	for {
+		res, err = tpl.GetUserInfo(userid, cursor)
+		if err != nil {
+			return result, err
+		}
+		result.FollowUser = append(result.FollowUser, res.FollowUser...)
+		result.ExternalContact = res.ExternalContact
+		if res.NextCursor != "" {
+			cursor = res.NextCursor
+		} else {
+			break
+		}
+	}
+	return result, nil
+}
+
+//GetUserInfo 获取客户详情
+func (tpl *Client) GetUserInfo(externalUserid string, cursor ...string) (result OneUser, err error) {
+	var accessToken string
+	accessToken, err = tpl.ctx.GetAccessToken()
+	if err != nil {
+		return
+	}
+	var page = ""
+	if len(cursor) > 0 {
+		page = cursor[0]
+	}
+	uri := fmt.Sprintf("%s?access_token=%s&external_userid=%s&cursor=%s", getUrl, accessToken, externalUserid, page)
+	var response []byte
+	response, err = util.HTTPGet(uri)
+	if err != nil {
+		return
+	}
+	err = json.Unmarshal(response, &result)
+	if err != nil {
+		return
+	}
+	if result.ErrCode != 0 {
+		err = fmt.Errorf("template msg send error : errcode=%v , errmsg=%v", result.ErrCode, result.ErrMsg)
+		return
+	}
+	return
+}
+
+//GetUserInfoListByUserId 批量获取客户详情
+func (tpl *Client) GetUserInfoListByUserIds(req ReqGetByUser) (userList []UserInfo, nextCursor string, err error) {
+	var accessToken string
+	accessToken, err = tpl.ctx.GetAccessToken()
+	if err != nil {
+		return
+	}
+	uri := fmt.Sprintf("%s?access_token=%s", getByUserBatchUrl, accessToken)
+	var response []byte
+	response, err = util.PostJSON(uri, req)
+	if err != nil {
+		return
+	}
+	var result resUserList
+	err = json.Unmarshal(response, &result)
+	if err != nil {
+		return
+	}
+	if result.ErrCode != 0 {
+		err = fmt.Errorf("template msg send error : errcode=%v , errmsg=%v", result.ErrCode, result.ErrMsg)
+		return
+	}
+	userList = result.ExternalContactList
+	nextCursor = result.NextCursor
+	return
+}
diff --git a/work/work.go b/work/work.go
index 451f81a..782d219 100644
--- a/work/work.go
+++ b/work/work.go
@@ -4,6 +4,7 @@ import (
 	"github.com/silenceper/wechat/v2/credential"
 	"github.com/silenceper/wechat/v2/work/config"
 	"github.com/silenceper/wechat/v2/work/context"
+	"github.com/silenceper/wechat/v2/work/externalcontact"
 	"github.com/silenceper/wechat/v2/work/kf"
 	"github.com/silenceper/wechat/v2/work/msgaudit"
 	"github.com/silenceper/wechat/v2/work/oauth"
@@ -65,3 +66,8 @@ func (wk *Work) GetUser() *user.User {
 func (wk *Work) GetCalendar() *tools.Calendar {
 	return tools.NewCalendar(wk.ctx)
 }
+
+//GetExternalContact 客户联系
+func (wk *Work) GetExternalContact() (*externalcontact.Client, error) {
+	return externalcontact.NewClient(wk.ctx.Config)
+}