diff --git a/app/services/courses_service.rb b/app/services/courses_service.rb
index 5d2957d4c..b97fa1a64 100644
--- a/app/services/courses_service.rb
+++ b/app/services/courses_service.rb
@@ -334,7 +334,7 @@ class CoursesService
     # end
     groupnum = 0
     groupnum = course.course_groups.length if course.course_groups
-    {:course => course,:syllabus_title => course.syllabus.nil? ? "":course.syllabus.title ,:work_unit => work_unit, :img_url => url_to_avatar(course),:current_user_is_member => current_user.nil? ? false : current_user.member_of_course?(course),:current_user_is_teacher => current_user.nil? ? false : is_course_teacher(current_user,course),:course_student_num => course ? course.student.count.to_s : 0,:groupnum => groupnum}
+    {:course => course,:syllabus_title => course.syllabus.nil? ? "":course.syllabus.title ,:work_unit => work_unit, :img_url => "/images/"+url_to_avatar(course),:current_user_is_member => current_user.nil? ? false : current_user.member_of_course?(course),:current_user_is_teacher => current_user.nil? ? false : is_course_teacher(current_user,course),:course_student_num => course ? course.student.count.to_s : 0,:groupnum => groupnum}
   end
 
   #创建课程
diff --git a/public/assets/wechat/edit_class_group.html b/public/assets/wechat/edit_class_group.html
index 3dda96d53..4c1c612a6 100644
--- a/public/assets/wechat/edit_class_group.html
+++ b/public/assets/wechat/edit_class_group.html
@@ -2,7 +2,7 @@
     <div loading-spinner></div>
 
     <div class="blue-title">分班管理</div>
-    <div class="class-detail-row f13 c-grey3"><img src="images/logo.png" ng-src="course.img_url" class="fl ml10 img-circle mt4" width="30"><span class="fl mt10 ml10 ng-binding">{{course.name}}</span><div class="cl"></div> </div>
+    <div class="class-detail-row f13 c-grey3"><img src="images/logo.png" ng-src="{{course.img_url}}" class="fl ml10 img-circle mt4" width="30"><span class="fl mt10 ml10 ng-binding">{{course.name}}</span><div class="cl"></div> </div>
     <form novalidate name="groupForm">
         <div class="course-list-row f13 c-grey3 mt10" ng-repeat="group in groups" ><span class="fl ml15 c-grey3">分班名称</span><input ng-change="group.change = true" required ng-class="['new-class-input ml25', {'c-grey':group.change} ]" ng-model="group.tmpname" placeholder="如：16级1班" /><a ng-click="deleteGroup($index)" class="fr mr10 c-grey6 delete-class-link">删除</a></div>
         <div class="tac"><a ng-click="addGroup()" class="link-blue2 f13 mt15 inline-block add-class-link">+新增分班</a></div>
diff --git a/public/assets/wechat/join_classgroup.html b/public/assets/wechat/join_classgroup.html
index 9a7e9fa2d..631ec4969 100644
--- a/public/assets/wechat/join_classgroup.html
+++ b/public/assets/wechat/join_classgroup.html
@@ -2,7 +2,7 @@
     <div loading-spinner></div>
     <div ng-show="current_course" class="post-container" style="padding-bottom:50px;">
         <div class="blue-title">欢迎加入班级</div>
-        <div class="class-detail-row f13 c-grey3"><img src="images/logo.png" ng-src="current_course.img_url" class="fl ml10 img-circle mt4" width="30"><span class="fl mt10 ml10 ng-binding">{{current_course.name}}</span><div class="cl"></div> </div>
+        <div class="class-detail-row f13 c-grey3"><img src="images/logo.png" ng-src="{{current_course.img_url}}" class="fl ml10 img-circle mt4" width="30"><span class="fl mt10 ml10 ng-binding">{{current_course.name}}</span><div class="cl"></div> </div>
         <div class="course-list-row f13 c-grey3 mt10"><span class="fl ml15">选择分班{{selectid}}</span></div>
         <ul class="class-list f13 c-grey3">
             <li><span class="fl ml10 class-list-name hidden">暂无</span><span ng-click="selectGroup(0)" class="login-box fr mr10 mt12 img-circle" ng-class="[{'checked': selectid == 0}]"></span></li>