diff --git a/wechat_client_test.go b/wechat_client_test.go
index f8878489..cf6a73b0 100644
--- a/wechat_client_test.go
+++ b/wechat_client_test.go
@@ -339,3 +339,19 @@ func TestDecryptOpenDataToStruct(t *testing.T) {
 	fmt.Println("CountryCode:", phone.CountryCode)
 	fmt.Println("Watermark:", phone.Watermark)
 }
+
+func TestGetOpenIdByAuthCode(t *testing.T) {
+	openIdRsp, err := GetOpenIdByAuthCode(AppID, MchID_iguiyu, "135127679952609396", ApiKey_iguiyu, GetRandomString(32))
+	if err != nil {
+		fmt.Println("err:", err)
+		return
+	}
+	fmt.Println("ReturnCode:", openIdRsp.ReturnCode)
+	fmt.Println("ReturnMsg:", openIdRsp.ReturnMsg)
+	fmt.Println("ResultCode:", openIdRsp.ResultCode)
+	fmt.Println("Appid:", openIdRsp.Appid)
+	fmt.Println("MchId:", openIdRsp.MchId)
+	fmt.Println("NonceStr:", openIdRsp.NonceStr)
+	fmt.Println("err_code:", openIdRsp.ErrCode)
+	fmt.Println("Openid:", openIdRsp.Openid)
+}
diff --git a/wechat_rsp.go b/wechat_rsp.go
index 547d8cf6..dadb9b91 100644
--- a/wechat_rsp.go
+++ b/wechat_rsp.go
@@ -268,3 +268,15 @@ type watermarkInfo struct {
 	Appid     string `json:"appid"`
 	Timestamp int    `json:"timestamp"`
 }
+
+type OpenIdByAuthCodeRsp struct {
+	ReturnCode string `xml:"return_code"`
+	ReturnMsg  string `xml:"return_msg"`
+	Appid      string `xml:"appid"`
+	MchId      string `xml:"mch_id"`
+	NonceStr   string `xml:"nonce_str"`
+	Sign       string `xml:"sign"`
+	ResultCode string `xml:"result_code"`
+	ErrCode    string `xml:"err_code"`
+	Openid     string `xml:"openid"` //用户唯一标识
+}
diff --git a/wechat_servier_api.go b/wechat_servier_api.go
index 361d8f0b..10c5a590 100644
--- a/wechat_servier_api.go
+++ b/wechat_servier_api.go
@@ -299,6 +299,40 @@ func GetAccessToken(appId, appSecret string) (accessToken *AccessToken, err erro
 	}
 }
 
+//授权码查询openid(AccessToken:157字符)
+//    appId:APPID
+//    mchId:商户号
+//    authCode:用户授权码
+//    nonceStr:随即字符串
+func GetOpenIdByAuthCode(appId, mchId, authCode, apiKey, nonceStr string) (openIdRsp *OpenIdByAuthCodeRsp, err error) {
+
+	url := "https://api.mch.weixin.qq.com/tools/authcodetoopenid"
+	body := make(BodyMap)
+	body.Set("appid", appId)
+	body.Set("mch_id", mchId)
+	body.Set("auth_code", authCode)
+	body.Set("nonce_str", nonceStr)
+	sign := getLocalSign(apiKey, SignType_MD5, body)
+
+	body.Set("sign", sign)
+	reqXML := generateXml(body)
+	//===============发起请求===================
+	agent := gorequest.New()
+	agent.Post(url)
+	agent.Type("xml")
+	agent.SendString(reqXML)
+	_, bs, errs := agent.EndBytes()
+	if len(errs) > 0 {
+		return nil, errs[0]
+	}
+	openIdRsp = new(OpenIdByAuthCodeRsp)
+	err = xml.Unmarshal(bs, openIdRsp)
+	if err != nil {
+		return nil, err
+	}
+	return openIdRsp, nil
+}
+
 //用户支付完成后，获取该用户的 UnionId，无需用户授权。
 //    accessToken：接口调用凭据
 //    openId：用户的OpenID