diff --git a/webapp/controller/ShopController.class.php b/webapp/controller/ShopController.class.php
index 93196ee3..79047e3c 100644
--- a/webapp/controller/ShopController.class.php
+++ b/webapp/controller/ShopController.class.php
@@ -1048,6 +1048,12 @@ class ShopController extends BaseAuthedController
         $count = getReqVal('count', 0);
 
         $conn = $this->_getMysql('');
+        error_log("buyGoodsDS start " + json_encode(array(
+            'idx' => $idx,
+            'grid' => $grid,
+            'count' => $count,
+        )
+        ));
 
         $row = SqlHelper::selectOne(
             $conn,