diff --git a/app/helpers/application_helper.rb b/app/helpers/application_helper.rb
index 232d46e2e..0db12e244 100644
--- a/app/helpers/application_helper.rb
+++ b/app/helpers/application_helper.rb
@@ -1090,9 +1090,7 @@ module ApplicationHelper
   end
 
   def back_url_hidden_field_tag
-    #add by xianbo 
-    url = nil
-    #leave the url remain
+    url = back_url
     hidden_field_tag('back_url', url, :id => nil) unless url.blank?
   end