diff --git a/app/controllers/wechats_controller.rb b/app/controllers/wechats_controller.rb
index 20ef9f473..b1bab6c56 100644
--- a/app/controllers/wechats_controller.rb
+++ b/app/controllers/wechats_controller.rb
@@ -3,18 +3,18 @@ class WechatsController < ActionController::Base
   wechat_responder
 
   include ApplicationHelper
-
+  # ROOT_URL = "#{Setting.protocol}://#{Setting.host_name}/"
+  ROOT_URL = "http://wechat.trustie.net"
   # default text responder when no other match
   on :text do |request, content|
       #邀请码
       if join_class(content)
-        root_url = "http://wechat.trustie.net"
 
         news = (1..1).each_with_object([]) { |n, memo| memo << { title: '恭喜您成功加入班级,开始学习吧!',
                                                                  content: "课程名称: 数据结构\n班级名称: 数据结构A班\n任课老师: 尹刚\n进入班级,和小伙伴愉快的学习吧!"} }
         request.reply.news(news) do |article, n, index| # article is return object
-          url = "https://open.weixin.qq.com/connect/oauth2/authorize?appid=#{Wechat.config.appid}&redirect_uri=#{root_url+'/wechat/user_activities'}&response_type=code&scope=snsapi_base&state=myclass#wechat_redirect"
-          pic_url = "#{Setting.protocol}://#{Setting.host_name}/images/wechat/class.jpg"
+          url = "https://open.weixin.qq.com/connect/oauth2/authorize?appid=#{Wechat.config.appid}&redirect_uri=#{ROOT_URL+'/wechat/user_activities'}&response_type=code&scope=snsapi_base&state=myclass#wechat_redirect"
+          pic_url = "#{ROOT_URL}/images/wechat/class.jpg"
           article.item title: "#{n[:title]}",
                        description: n[:content],
                        pic_url: pic_url,
@@ -164,16 +164,14 @@ class WechatsController < ActionController::Base
   end
 
   def sendBind(request)
-    root_url = "http://wechat.trustie.net"
-
     news = (1..1).each_with_object([]) { |n, memo| memo << { title: '绑定登录', content: "欢迎使用Trustie创新实践服务平台！
 在这里您可以随时了解您的课程和项目动态，随时点赞和回复。
 我们将会与微信不断结合，为您提供更有价值的服务。
 
 您还未绑定确实的用户，请先绑定，谢谢！" } }
     request.reply.news(news) do |article, n, index| # article is return object
-      url = "https://open.weixin.qq.com/connect/oauth2/authorize?appid=#{Wechat.config.appid}&redirect_uri=#{root_url+'/wechat/user_activities'}&response_type=code&scope=snsapi_base&state=login#wechat_redirect"
-      pic_url = "#{Setting.protocol}://#{Setting.host_name}/images/weixin_pic.jpg"
+      url = "https://open.weixin.qq.com/connect/oauth2/authorize?appid=#{Wechat.config.appid}&redirect_uri=#{ROOT_URL+'/wechat/user_activities'}&response_type=code&scope=snsapi_base&state=login#wechat_redirect"
+      pic_url = "#{ROOT_URL}/images/weixin_pic.jpg"
       article.item title: "#{n[:title]}",
                    description: n[:content],
                    pic_url: pic_url,