diff --git a/webapp/controller/ShopController.class.php b/webapp/controller/ShopController.class.php
index 8af0fb77..82299e99 100644
--- a/webapp/controller/ShopController.class.php
+++ b/webapp/controller/ShopController.class.php
@@ -1086,7 +1086,15 @@ class ShopController extends BaseAuthedController
         $price = $this->normalizeWeb3Price($goods['price'] * $count);
         $item_id = $goods['goods_id'];
         $item_count = $goods['goods_num'] * $count;
-
+        error_log("buyGoodsDS start " . json_encode(array(
+            'idx' => $idx,
+            'grid' => $grid,
+            'count' => $count,
+            'price' => $price,
+            'item_id' => $item_id,
+            'item_count' => $item_count,
+        )
+        ));
         $response = services\BlockChainService::gameItemMallBuy(
             Transaction::BUY_GOODS_ACTION_TYPE,
             $price,