diff --git a/webapp/controller/ShopController.class.php b/webapp/controller/ShopController.class.php
index 252374db..93196ee3 100644
--- a/webapp/controller/ShopController.class.php
+++ b/webapp/controller/ShopController.class.php
@@ -1061,6 +1061,13 @@ class ShopController extends BaseAuthedController
             array('idx' => $idx)
         );
 
+        error_log("buyGoodsDS start " + json_encode(array(
+            'idx' => $idx,
+            'grid' => $grid,
+            'count' => $count,
+        )
+        ));
+
         if (!$row) {
             $this->_rspErr(2, 'idx is invalid');
             return;