diff --git a/webapp/controller/BagController.class.php b/webapp/controller/BagController.class.php
index 2a856d38..775e1307 100644
--- a/webapp/controller/BagController.class.php
+++ b/webapp/controller/BagController.class.php
@@ -892,6 +892,12 @@ class BagController extends BaseAuthedController {
             $this->_rspErr(201, "alreay use");
             return ;
         }
+        $this->_decItems(array(
+            array(
+                'item_id' => $itemMeta['id'],
+                'item_num' => 1
+            )
+        ));
         LuckySymbol::add();
         myself()->_rspOk();
     }