diff --git a/doc/Shop.py b/doc/Shop.py
index 0b72127..3a69501 100644
--- a/doc/Shop.py
+++ b/doc/Shop.py
@@ -29,12 +29,27 @@ class Shop(object):
                     _common.ReqHead(),
                     ['shop_id', 0, '商店id shop_id=100特殊商店id'],
                     ['goods_id', 0, '商品id'],
+                    ['goods_num', 0, '商品数量'],
                     ['cost_item_id', 0, '支付方式'],
                 ],
                 'response': [
                     _common.RspHead(),
                     ['award', _common.Award(), '奖励信息'],
                     ['property_chg', _common.PropertyChg(), '属性变更'],
+                    ['goods_chg', _common.Goods(), '购买后更新商品的最新信息'],
+                ]
+            },
+            {
+                'name': 'getDiscountList',
+                'desc': '获取商品折扣列表',
+                'group': 'Shop',
+                'url': 'webapp/index.php?c=Shop&a=getDiscountList',
+                'params': [
+                    _common.ReqHead(),
+                ],
+                'response': [
+                    _common.RspHead(),
+                    ['!goods_list', [_common.DiscountInfo()], '折扣的商品列表'],
                 ]
             },
         ]
diff --git a/doc/_common.py b/doc/_common.py
index f066ccb..f61027e 100644
--- a/doc/_common.py
+++ b/doc/_common.py
@@ -130,6 +130,14 @@ class PriceInfo(object):
             ['discount_end_time', 0, '折扣结束时间(utc时间)'],
         ]
 
+class DiscountInfo(object):
+
+    def __init__(self):
+        self.fields = [
+            ['item_id', 0, '购买需要消耗的道具id'],
+            ['discount', 0, '折扣百分比（0-100）'],
+        ]
+
 class ItemPriceInfo(object):
 
     def __init__(self):
diff --git a/webapp/controller/ShopController.class.php b/webapp/controller/ShopController.class.php
index 8103f7f..b31ef6c 100644
--- a/webapp/controller/ShopController.class.php
+++ b/webapp/controller/ShopController.class.php
@@ -97,8 +97,13 @@ class ShopController extends BaseAuthedController {
         $goodsId = getReqVal('goods_id', 0);
         $itemNum = getReqVal('goods_num', 0);
         $costItemId = getReqVal('cost_item_id', 0);
-
         $itemId = $goodsId;
+
+        if ($shopId == mt\Shop::OUTSIDE_SHOP) {
+            $this->outsideBuy($shopId, $itemId, $itemNum, $costItemId);
+            return;
+        }
+
         $itemMeta = mt\Item::get($itemId);
         if (!$itemMeta) {
             $this->_rspErr(1, 'goods_id参数错误');
@@ -191,12 +196,8 @@ class ShopController extends BaseAuthedController {
         ));
     }
 
-    private function outsideBuy()
+    private function outsideBuy($shopId, $itemId, $itemNum, $costItemId)
     {
-        $itemId = getReqVal('item_id', 0);
-        $itemNum = getReqVal('item_num', 0);
-        $costItemId = getReqVal('cost_item_id', 0);
-
         $itemMeta = mt\Item::get($itemId);
         if (!$itemMeta) {
             $this->_rspErr(1, 'item_id参数错误');