diff --git a/webapp/controller/MallController.class.php b/webapp/controller/MallController.class.php
index 4c94c00b..3fc20a85 100644
--- a/webapp/controller/MallController.class.php
+++ b/webapp/controller/MallController.class.php
@@ -25,6 +25,9 @@ use services\PropertyChgService;
 
 class MallController extends BaseAuthedController {
 
+    const PRICE_LOW = '1';
+    const PRICE_HIGH = '111111111111111111111000000000000000000';
+
     public function productList()
     {
         $page = getReqVal('page', 0);