diff --git a/public/assets/wechat/edit_class_group.html b/public/assets/wechat/edit_class_group.html
index 756670b2a..f13f02100 100644
--- a/public/assets/wechat/edit_class_group.html
+++ b/public/assets/wechat/edit_class_group.html
@@ -4,7 +4,7 @@
     <div class="blue-title">分班管理</div>
     <div class="class-detail-row f13 c-grey3"><img ng-src="{{course.img_url}}" class="fl ml10 img-circle mt4" width="30" height="30"><span class="fl mt10 ml10 ng-binding">{{course.syllabus_title}}<font ng-if="course.syllabus_title != null" class="fb" style="height:18px; line-height:18px; vertical-align:top; margin:0 3px;">·</font>{{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($index)" class="fr mr10 c-grey6 delete-class-link">删除</a></div>
+        <div class="course-list-row f13 c-grey3 mt10" ng-repeat="group in groups" ><span class="fl ml15 c-grey3">分班名称</span><input ng-change="group.change = true" required ng-class="['new-class-input ml25', {'c-grey':group.change} ]" ng-model="group.tmpname" placeholder="如：16级1班" maxlength="20" /><a ng-click="deleteGroup($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>
         <a ng-click="newGroup(groupForm, groups)" ng-class="['finish-btn', {'btn-disabled':!groupForm.$valid} ]" >完成</a>
     </form>