diff --git a/app/controllers/wechats_controller.rb b/app/controllers/wechats_controller.rb
index 00585722c..5edaf63e5 100644
--- a/app/controllers/wechats_controller.rb
+++ b/app/controllers/wechats_controller.rb
@@ -128,8 +128,13 @@ class WechatsController < ActionController::Base
     default_msg(request)
   end
 
-  on :click, with: 'JOIN_CLASS' do |reques, key|
-    request.reply.text "请直接回复班级邀请码 (不区分大小写):"
+  on :click, with: 'JOIN_CLASS' do |request, key|
+    uw = user_binded?(request[:FromUserName])
+    unless uw
+      sendBind(request)
+    else
+      request.reply.text "请直接回复班级邀请码 (不区分大小写):"
+    end
   end
 
   def default_msg(request)