diff --git a/webapp/controller/BagController.class.php b/webapp/controller/BagController.class.php
index 94e132a0..a47c83a7 100644
--- a/webapp/controller/BagController.class.php
+++ b/webapp/controller/BagController.class.php
@@ -250,6 +250,17 @@ class BagController extends BaseAuthedController {
     {
         $errCode = 0;
         $errMsg = '';
+        $targetUniId = $param1;
+        $targetDb = Bag::findByUniId($targetUniId);
+        if (!$targetDb) {
+            $this->_rspErr(1, "You don't have the item yet");
+            return;
+        }
+        Bag::decItemByUnIid($itemDb['item_uniid'], $itemNum);
+        $this->propertyChgService->addBagChg();
+        $this->_rspData(array(
+            'property_chg' => $this->propertyChgService->toDto(),
+        ));
     }
 
 }
diff --git a/webapp/models/Bag.php b/webapp/models/Bag.php
index cb1d180b..9ed0a12f 100644
--- a/webapp/models/Bag.php
+++ b/webapp/models/Bag.php
@@ -24,6 +24,19 @@ class Bag extends BaseModel {
         return $row;
     }
 
+    public static function findByUniId($itemUniId)
+    {
+        $row = SqlHelper::ormSelectOne(
+            myself()->_getSelfMysql(),
+            't_bag',
+            array(
+                'account_id' => myself()->_getAccountId(),
+                'idx' => $itemUniId,
+            )
+        );
+        return $row;
+    }
+
     public static function findByType($type, $subType = null)
     {
         foreach (self::all() as $itemDto) {