diff --git a/webapp/controller/ShopController.class.php b/webapp/controller/ShopController.class.php
index 2fbe6579..729480b3 100644
--- a/webapp/controller/ShopController.class.php
+++ b/webapp/controller/ShopController.class.php
@@ -316,7 +316,7 @@ class ShopController extends BaseAuthedController {
             return;
         }
 
-        $orderId = OrderId::gen();
+        $orderId = OrderId::genInappOrderId();
         InAppOrder::add(
             $orderId,
             $platform,
diff --git a/webapp/models/OrderId.php b/webapp/models/OrderId.php
index de5f8503..f5ad8995 100644
--- a/webapp/models/OrderId.php
+++ b/webapp/models/OrderId.php
@@ -9,7 +9,8 @@ use phpcommon\SqlHelper;
 
 class OrderId {
 
-    public static function gen(){
+    public static function gen()
+    {
         SqlHelper::insert
         (myself()->_getSelfMysql(),
             't_orderid',
@@ -25,4 +26,23 @@ class OrderId {
         return $orderId;
     }
 
+    public static function genInappOrderId()
+    {
+        $orderId = self::gen();
+        if (strlen($orderId) > 32) {
+            error_log('genInappOrderId error order_id ' . $orderId);
+            die();
+        }
+        $newOrderId = $orderId;
+        while (strlen($newOrderId) < 32) {
+            $newOrderId .= 'A';
+        }
+        $newOrderId = substr($newOrderId, 0, 8) . '-' .
+                    substr($newOrderId, 8, 4) . '-' .
+                    substr($newOrderId, 12, 4) . '-' .
+                    substr($newOrderId, 16, 4) . '-' .
+                    substr($newOrderId, 20, 12);
+        return $newOrderId;
+    }
+
 }