diff --git a/pay/notify_result.go b/pay/notify_result.go
new file mode 100644
index 0000000..fe04a8a
--- /dev/null
+++ b/pay/notify_result.go
@@ -0,0 +1,84 @@
+package pay
+
+import (
+	"fmt"
+	"github.com/silenceper/wechat/util"
+	"sort"
+)
+
+// Base 公用参数
+type Base struct {
+	AppID    string `xml:"appid"`
+	MchID    string `xml:"mch_id"`
+	NonceStr string `xml:"nonce_str"`
+	Sign     string `xml:"sign"`
+}
+
+// NotifyResult 下单回调
+type NotifyResult struct {
+	Base
+	ReturnCode    string `xml:"return_code"`
+	ReturnMsg     string `xml:"return_msg"`
+	ResultCode    string `xml:"result_code"`
+	OpenID        string `xml:"openid"`
+	IsSubscribe   string `xml:"is_subscribe"`
+	TradeType     string `xml:"trade_type"`
+	BankType      string `xml:"bank_type"`
+	TotalFee      int    `xml:"total_fee"`
+	FeeType       string `xml:"fee_type"`
+	CashFee       int    `xml:"cash_fee"`
+	CashFeeType   string `xml:"cash_fee_type"`
+	TransactionID string `xml:"transaction_id"`
+	OutTradeNo    string `xml:"out_trade_no"`
+	Attach        string `xml:"attach"`
+	TimeEnd       string `xml:"time_end"`
+}
+
+// NotifyResp 消息通知返回
+type NotifyResp struct {
+	ReturnCode string `xml:"return_code"`
+	ReturnMsg  string `xml:"return_msg"`
+}
+
+// VerifySign 验签
+func (pcf *Pay) VerifySign(notifyRes NotifyResult) bool {
+	// 封装map 请求过来的 map
+	resMap := make(map[string]interface{})
+	resMap["appid"] = notifyRes.AppID
+	resMap["bank_type"] = notifyRes.BankType
+	resMap["cash_fee"] = notifyRes.CashFee
+	resMap["fee_type"] = notifyRes.FeeType
+	resMap["is_subscribe"] = notifyRes.IsSubscribe
+	resMap["mch_id"] = notifyRes.MchID
+	resMap["nonce_str"] = notifyRes.NonceStr
+	resMap["openid"] = notifyRes.OpenID
+	resMap["out_trade_no"] = notifyRes.OutTradeNo
+	resMap["result_code"] = notifyRes.ResultCode
+	resMap["return_code"] = notifyRes.ReturnCode
+	resMap["time_end"] = notifyRes.TimeEnd
+	resMap["total_fee"] = notifyRes.TotalFee
+	resMap["trade_type"] = notifyRes.TradeType
+	resMap["transaction_id"] = notifyRes.TransactionID
+	// 支付key
+	sortedKeys := make([]string, 0, len(resMap))
+	for k := range resMap {
+		sortedKeys = append(sortedKeys, k)
+	}
+	sort.Strings(sortedKeys)
+	// STEP2, 对key=value的键值对用&连接起来，略过空值
+	var signStrings string
+	for _, k := range sortedKeys {
+		value := fmt.Sprintf("%v", resMap[k])
+		if value != "" {
+			signStrings = signStrings + k + "=" + value + "&"
+		}
+	}
+	// STEP3, 在键值对的最后加上key=API_KEY
+	signStrings = signStrings + "key=" + pcf.PayKey
+	// STEP4, 进行MD5签名并且将所有字符转为大写.
+	sign := util.MD5Sum(signStrings)
+	if sign != notifyRes.Sign {
+		return false
+	}
+	return true
+}