diff --git a/public/javascripts/wechat/directives/iphone_recognize.js b/public/javascripts/wechat/directives/iphone_recognize.js
index fabba0e51..66014e71a 100644
--- a/public/javascripts/wechat/directives/iphone_recognize.js
+++ b/public/javascripts/wechat/directives/iphone_recognize.js
@@ -1,24 +1,28 @@
 /**
  * Created by ttang on 2016/8/22.
  */
-app.directive('iphoneRecognize',function(){
+app.directive('iphoneRecognize',["$timeout",function(timer){
     return{
         restrict: 'A',
         scope: {},
         link: function(scope, element){
-            var userAgent = navigator.userAgent;
+           timer(function(){
+               var userAgent = navigator.userAgent;
+               var contentHeight = $(".post-container").height();
             if (/ipad|iphone|mac/i.test(navigator.userAgent)){
-                $("#postInput1").bind('focus',function(){
-                    element.css({"position":"relative","padding":"1px 0"});
-                    $(".post-wrapper").css("margin-bottom","0");
-                    $("#all_homework_reply").css("margin-bottom","0");
-                });
-                $("#postInput1").bind('blur',function(){
-                    element.css("position","fixed");
-                    $(".post-wrapper").css("margin-bottom","10px");
-                    $("#all_homework_reply").css("margin-bottom","50px");
-                });
+               $("#postInput1").bind('focus',function(){
+                   element.css({"position":"relative","padding":"1px 0"});
+                   $(".post-wrapper").css("margin-bottom","0");
+                   $("#all_homework_reply").css("margin-bottom","0");
+                   window.scrollTo(0,contentHeight);
+               });
+               $("#postInput1").bind('blur',function(){
+                   element.css("position","fixed");
+                   $(".post-wrapper").css("margin-bottom","10px");
+                   $("#all_homework_reply").css("margin-bottom","50px");
+               });
             }
+           })
         }
     }
-});
\ No newline at end of file
+}]);
\ No newline at end of file