diff --git a/app/libs/hot_search_keyword.rb b/app/libs/hot_search_keyword.rb
new file mode 100644
index 000000000..e222bf3a7
--- /dev/null
+++ b/app/libs/hot_search_keyword.rb
@@ -0,0 +1,22 @@
+class HotSearchKeyword
+  class << self
+    def add(keyword)
+      return if keyword.blank?
+      Rails.cache.data.zincrby(redis_key, 1, keyword)
+    end
+
+    def hot(limit = 5)
+      Rails.cache.data.zrevrange(redis_key, 0, limit - 1)
+    end
+
+    def available?
+      Rails.cache.is_a?(ActiveSupport::Cache::RedisStore)
+    end
+
+    private
+
+    def redis_key
+      'educoder:es:hot_keyword'
+    end
+  end
+end
\ No newline at end of file
diff --git a/app/services/create_bind_user_service.rb b/app/services/create_bind_user_service.rb
index 93d9d87ca..f7fc5b6f6 100644
--- a/app/services/create_bind_user_service.rb
+++ b/app/services/create_bind_user_service.rb
@@ -17,7 +17,7 @@ class CreateBindUserService < ApplicationService
 
     bind_user = User.try_to_login(params[:username], params[:password])
     raise Error, '用户名或者密码错误' if bind_user.blank?
-    raise Error, '该账号已被绑定' if bind_user.bind_open_user?(params[:type].to_s)
+    raise Error, '该账号已被其他微信号绑定，请更换其他账号进行绑定' if bind_user.bind_open_user?(params[:type].to_s)
 
     ActiveRecord::Base.transaction do
       open_user.user_id = bind_user.id
diff --git a/public/react/src/modules/courses/common/titleSearch/TitleSearchSection.js b/public/react/src/modules/courses/common/titleSearch/TitleSearchSection.js
index aa7a54cce..c71ef38ea 100644
--- a/public/react/src/modules/courses/common/titleSearch/TitleSearchSection.js
+++ b/public/react/src/modules/courses/common/titleSearch/TitleSearchSection.js
@@ -61,7 +61,8 @@ class Titlesearchsection extends Component{
 
           <p className="clearfix padding30 bor-bottom-greyE">
             <p style={{height: '20px'}}>
-              <span className="font-18 fl color-dark-21 filesnameslist" title={title}>{title}</span>
+            {/* title={title} */}
+              <span className="font-18 fl color-dark-21 filesnameslist" >{title}</span>
               <li className="fr font-16">
                 { firstRowRight }
               </li>
diff --git a/public/react/src/modules/courses/members/studentsList.js b/public/react/src/modules/courses/members/studentsList.js
index a63509c59..8a223ce91 100644
--- a/public/react/src/modules/courses/members/studentsList.js
+++ b/public/react/src/modules/courses/members/studentsList.js
@@ -710,7 +710,7 @@ class studentsList extends Component{
           title={isParent ? (pageType == TYPE_STUDENTS ? "全部学生" : "学生列表"): 
             <React.Fragment>
               <span>
-                <Tooltip title="返回">
+                <Tooltip title="返回至分班列表">
                   <i className="icon-zuojiantou iconfont font-14" onClick={() => { this.props.history.push(`/courses/${courseId}/course_groups`)}}
                     style={{color: '#212121', verticalAlign: 'initial', marginRight: '14px' }}
                   ></i>
diff --git a/public/react/src/modules/courses/poll/PollDetailTabForthRules.js b/public/react/src/modules/courses/poll/PollDetailTabForthRules.js
index ce1ee843e..19a65f7e7 100644
--- a/public/react/src/modules/courses/poll/PollDetailTabForthRules.js
+++ b/public/react/src/modules/courses/poll/PollDetailTabForthRules.js
@@ -350,6 +350,12 @@ class PollDetailTabForthRules extends Component{
           <span className="fl pr20 color-grey-c with25">(学生收到{this.props.moduleName || (this.props.type==="Exercise"?"试卷":"问卷")}的时间)</span>
           <span className="fl color-grey-c">({this.props.moduleName == '作业' ? '学生“按时”提交作品的时间截点' : '学生可以答题的时间截点'})</span>
         </p>
+        {/* item宽度超长 */}
+        <style>{`
+          .setInfo .ant-select-selection--multiple .ant-select-selection__choice__content {
+            max-width: 300px;
+          }
+        `}</style>
         
         {
           rules && rules.length > 0 && rules.map((rule,r)=>{
@@ -383,7 +389,8 @@ class PollDetailTabForthRules extends Component{
                       `.ant-select{
                             min-width:200px,
                             min-heigth:200px
-                      }`
+                      }
+                      `
                     }
                   </style>
 										<Select