diff --git a/backstage/application/api/controllers/api/Applet.php b/backstage/application/api/controllers/api/Applet.php
index 1052830..6057c46 100644
--- a/backstage/application/api/controllers/api/Applet.php
+++ b/backstage/application/api/controllers/api/Applet.php
@@ -180,4 +180,33 @@ class Applet extends REST_Controller {
             )
         ), REST_Controller::HTTP_OK);
     }
+
+    public function updateAppletOpenid_post(){
+        $user_id = $this->user->id;
+        $uid = $this->input->post("uid", true);
+        if($user_id != $uid){
+            $this->response(array(
+                'status' => 0,
+                'message' => 'token和uid不匹配',
+
+            ), REST_Controller::HTTP_OK);
+        }
+        $applet_openid = $this->input->post("applet_openid", true);
+
+        // 先清空关于这个openid的数据
+        $this->User_model->clearAppletOpenid($applet_openid);
+
+        $res = $this->User_model->update_user(array('applet_openid' => $applet_openid), $user_id);
+        if($res){
+            $this->response(array(
+                'status' => 1,
+                'message' => '更新成功',
+            ), REST_Controller::HTTP_OK);
+        }else{
+            $this->response(array(
+                'status' => 0,
+                'message' => '更新失败',
+            ), REST_Controller::HTTP_OK);
+        }
+    }
 }
diff --git a/backstage/application/api/models/User_model.php b/backstage/application/api/models/User_model.php
index 73b0f74..471ef61 100644
--- a/backstage/application/api/models/User_model.php
+++ b/backstage/application/api/models/User_model.php
@@ -1174,4 +1174,11 @@ class User_model extends CI_Model
         $rs = $this->db->query($sql)->result_array();
         return $rs[0];
     }
+
+    // 清空指定applet_openid
+    public function clearAppletOpenid($openid){
+        $this->db->where('applet_openid', $openid);
+        $data = array('applet_openid' => null);
+        return $this->db->update('tb_user', $data);
+    }
 }
diff --git a/show/get.php b/show/get.php
index 64e1674..bd00716 100644
--- a/show/get.php
+++ b/show/get.php
@@ -228,7 +228,7 @@ if($act == 'applet_unifiedorder') {
   if($isjsapi) {
     $openid = $user['applet_openid'];
     if(!$openid) {
-      echoRs(0, '非小程序注册用户！不能使用小程序支付！');
+      echoRs(0, '获取openid失败，请在小程序里重新登录再试！');
     }
   }
   $host = $_SERVER['HTTP_HOST'];