diff --git a/webapp/controller/ShopController.class.php b/webapp/controller/ShopController.class.php
index b6b85992..ff0041f5 100644
--- a/webapp/controller/ShopController.class.php
+++ b/webapp/controller/ShopController.class.php
@@ -1164,6 +1164,7 @@ class ShopController extends BaseAuthedController
             $this->_rspErr(2, 'id is invalid');
             return;
         }
+        $cost = $shop['price'] * $num;
         $isFreeBuy = false;
         if (!empty($shop['free_type'])) {
             $count = $this->countFreeBuyTimes($shop);
@@ -1171,21 +1172,22 @@ class ShopController extends BaseAuthedController
                 $isFreeBuy = true;
             }
         }
-        $cost = $shop['price'] * $num;
-        if ($isFreeBuy) {
-            $cost = 0;
-        }
-
-        $recommend = $shop['recommend'];
-
-        $itemStore = mt\ShopChest::getRandomItemListByChestType($recommend);
         if ($isFreeBuy) {
             if ($num != 1) {
                 $this->_rspErr(2, 'num is invalid');
                 return;
             }
+        } else {
+            $gold = 500;
+            if ($gold < $cost) {
+                $this->_rspErr(2, 'gold is not enough');
+                return;
+            }
+            $gold -= $cost;
         }
 
+        $recommend = $shop['recommend'];
+        $itemStore = mt\ShopChest::getRandomItemListByChestType($recommend);
         $result = array();
         for ($i = 0; $i < $num; $i++) {
             $record = array();
@@ -1203,7 +1205,7 @@ class ShopController extends BaseAuthedController
                 $record[$key] = array("item_id" => $item['item_id'], "item_num" => $item['num']);
                 array_push($result, $record[$key]);
             }
-            if ($isFreeBuy && $num == 1) {
+            if ($isFreeBuy) {
                 $this->addFreeBuyRecord($shop);    
             }
         }
@@ -1211,6 +1213,10 @@ class ShopController extends BaseAuthedController
         error_log("buyBlindBox start " . json_encode(
             array(
                 'account' => $account,
+                'id' => $id,
+                'num' => $num,
+                'cost' => $cost,
+                'freeBuy' => $isFreeBuy,
                 'itemListStore' => $result,
             )
         ));