diff --git a/control.go b/control.go
index bc993d6..b4fa4d8 100644
--- a/control.go
+++ b/control.go
@@ -104,7 +104,7 @@ func SignTask() {
 	//签到任务
 	for _, u := range data {
 		pre := "您的账户: " + u.alias + "\n在任务执行时出现了错误!\n错误:"
-		access, err := MSGetToken(u.refreshToken, u.clientId, u.clientSecret)
+		access, newRefreshToken, err := MSGetToken(u.refreshToken, u.clientId, u.clientSecret)
 		chat, _ := bot.ChatByID(strconv.FormatInt(u.tgId, 10))
 
 		//生成解绑按钮
@@ -130,6 +130,7 @@ func SignTask() {
 			continue
 		}
 		u.uptime = time.Now().Unix()
+		u.refreshToken = newRefreshToken
 		if ok, err := UpdateData(u); !ok {
 			logger.Println(u.msId+" ", err)
 			bot.Send(chat, pre+err.Error(), tmpBtn)
diff --git a/outlook.go b/outlook.go
index 9f04a0d..02e8703 100644
--- a/outlook.go
+++ b/outlook.go
@@ -60,8 +60,8 @@ func MSFirGetToken(code, cid, cse string) (access string, refresh string, Error
 	return "", "", errors.New(string(content))
 }
 
-//return access_token
-func MSGetToken(refreshtoken, cid, cse string) (access string, Error error) {
+//return access_token and new refresh token
+func MSGetToken(refreshtoken, cid, cse string) (access string, newRefreshToken string, Error error) {
 	var r http.Request
 	client := &http.Client{}
 	r.ParseForm()
@@ -76,25 +76,25 @@ func MSGetToken(refreshtoken, cid, cse string) (access string, Error error) {
 	req, err := http.NewRequest("POST", MsApiUrl+"/common/oauth2/v2.0/token", body)
 	if err != nil {
 		logger.Println(err)
-		return "", err
+		return "", "", err
 	}
 	resp, err := client.Do(req)
 	if err != nil {
 		logger.Println(err)
-		return "", err
+		return "", "", err
 	}
 	defer resp.Body.Close()
 	content, err := ioutil.ReadAll(resp.Body)
 	if err != nil {
 		logger.Println(err)
-		return "", err
+		return "", "", err
 	}
 	//fmt.Println(string(content))
 	//fmt.Println(gjson.Get(string(content), "access_token").String())
 	if gjson.Get(string(content), "token_type").String() == "Bearer" {
-		return gjson.Get(string(content), "access_token").String(), nil
+		return gjson.Get(string(content), "access_token").String(), gjson.Get(string(content), "refresh_token").String(), nil
 	}
-	return "", errors.New(string(content))
+	return "", "", errors.New(string(content))
 }
 
 //Get User's Information