diff --git a/app/services/courses_service.rb b/app/services/courses_service.rb
index 1e0bfbec2..fb01e0398 100644
--- a/app/services/courses_service.rb
+++ b/app/services/courses_service.rb
@@ -300,6 +300,7 @@ class CoursesService
   #@state == 4 您加入的课程不存在
   #@state == 5 您还未登录
   #@state == 6 申请成功，请等待审核完毕
+  #@state == 7 您已经发送过申请了，请耐心等待
   #@state 其他 未知错误，请稍后再试
   def join_course params,current_user
     course = Course.find_by_id params[:object_id]
@@ -313,6 +314,8 @@ class CoursesService
             #如果加入角色为学生
             if params[:role] == "10"
               @state = 3
+            elsif current_user.allowed_to?(:as_teacher,course)
+              @state = 3
             else
               #如果加入角色为教师或者教辅
               CourseMessage.create(:user_id => course.tea_id, :course_id => course.id, :viewed => false,:content=> params[:role],:course_message_id=>User.current.id,:course_message_type=>'JoinCourseRequest',:status=>0)
@@ -330,8 +333,13 @@ class CoursesService
               StudentsForCourse.create(:student_id => current_user.id, :course_id => params[:object_id])
               @state = 0
             else
-              CourseMessage.create(:user_id => course.tea_id, :course_id => course.id, :viewed => false,:content=> params[:role],:course_message_id=>User.current.id,:course_message_type=>'JoinCourseRequest',:status=>0)
-              @state = 6
+              #如果已经发送过消息了，那么就要给个提示
+              if CourseMessage.where("course_message_type = 'JoinCourseRequest' and user_id = #{course.tea_id} and content = #{params[:role]} and course_message_id = #{User.current.id} and course_id = #{course.id} and status = 0").count != 0
+                @state = 7
+              else
+                CourseMessage.create(:user_id => course.tea_id, :course_id => course.id, :viewed => false,:content=> params[:role],:course_message_id=>User.current.id,:course_message_type=>'JoinCourseRequest',:status=>0)
+                @state = 6
+              end
             end
           else
             @state = 1
diff --git a/app/views/courses/join.js.erb b/app/views/courses/join.js.erb
index 53cf250d7..8e6f8ce20 100644
--- a/app/views/courses/join.js.erb
+++ b/app/views/courses/join.js.erb
@@ -4,22 +4,26 @@ $("#join_in_course_header").html("<%= escape_javascript(join_in_course_header(@c
 <% if @state %>
 <% if @state == 0 %>
 alert("加入成功");
-hideModal($("#popbox02"));
-$("#try_join_course_link").replaceWith("<a href='<%=url_for(:controller => 'homework_common', :action => 'index',:course=>course.id, :host=>Setting.host_course)%>' target='_blank' class='blue_n_btn fr mt20'>提交作品</a>");
-window.location.href= "http://"+"<%= Setting.host_name%>"+"/courses/" + "<%= course.id%>"
+hidden_join_course_form();
+$("#try_join_course_link").replaceWith("<a href='<%=url_for(:controller => 'homework_common', :action => 'index',:course=>@course.id, :host=>Setting.host_course)%>' target='_blank' class='blue_n_btn fr mt20'>提交作品</a>");
+window.location.href= "http://"+"<%= Setting.host_name%>"+"/courses/" + "<%= @course.id%>"
 <% elsif @state == 1 %>
 alert("密码错误");
 <% elsif @state == 2 %>
 alert("课程已过期\n请联系课程管理员重启课程。(在配置课程处)");
 <% elsif @state == 3 %>
 alert("您已经加入了课程");
-window.location.href= "http://"+"<%= Setting.host_name%>"+"/courses/" + "<%= course.id%>"
+window.location.href= "http://"+"<%= Setting.host_name%>"+"/courses/" + "<%= @course.id%>"
 <% elsif @state == 4 %>
 alert("您加入的课程不存在");
 <% elsif @state == 5 %>
 alert("您还未登录");
 <% elsif @state == 6 %>
-alert("申请成功，请等待审核")
+alert("申请成功，请等待审核");
+hidden_join_course_form();
+<% elsif @state == 7%>
+  alert("您已经发送过申请了，请耐心等待");
+hidden_join_course_form();
 <% else %>
 alert("未知错误，请稍后再试");
 <% end %>
diff --git a/app/views/users/_user_message_course.html.erb b/app/views/users/_user_message_course.html.erb
index 91ea32a62..d7042b6c2 100644
--- a/app/views/users/_user_message_course.html.erb
+++ b/app/views/users/_user_message_course.html.erb
@@ -157,7 +157,8 @@
               <li>匿评截止：<span style="color:Red;"><%= ma.course_message.homework_detail_manual.evaluation_end %>&nbsp;&nbsp;24点</span></li>
             </ul>
             <% unless User.current.allowed_to?(:as_teacher, ma.course_message.course)%>
-              <p>请您尽早完成匿评！如果您在规定时间内未完成匿评，一次将被扣<%= ma.course_message.homework_detail_manual.absence_penalty %>分。</p>
+              <p>请您尽早完成匿评！如果您在截止日期前未完成匿评，您的最终成绩将被扣除<%= ma.course_message.homework_detail_manual.absence_penalty %>分乘以缺评份数。</p>
+              <p>例如，您缺评了两份作品，则您的最终成绩将被扣除 <%= ma.course_message.homework_detail_manual.absence_penalty %> * 2 = <%= ma.course_message.homework_detail_manual.absence_penalty * 2 %>分</p>
             <% end%>
           </div>
           <li class="homepageNewsTime fl"><%= time_tag(ma.created_at).html_safe %> </li>
diff --git a/public/stylesheets/new_user.css b/public/stylesheets/new_user.css
index 29d3397c6..6f9f1f945 100644
--- a/public/stylesheets/new_user.css
+++ b/public/stylesheets/new_user.css
@@ -1274,7 +1274,7 @@ a:hover.tijiao{ background:#0f99a9;}
 #cboxPrevious{position:absolute; bottom:0px; left:0; color:#444;}
 #cboxNext{position:absolute; bottom:0px; left:63px; color:#444;}
 #cboxClose{position:absolute; bottom:0; right:0; display:block; color:#444;}
-.system_message_style {line-height: 19.1px; max-width: 681px; work-wrap: break-word; word-break: break-all; text-overflow:clip;}
+.system_message_style {line-height: 19.1px; max-width: 681px; work-wrap: break-word; word-break: break-all; text-overflow:clip; z-index:9999}
 .system_message_style img {max-width: 100%;}
 /*20150906关联项目LB*/
 a.RalationIcon{  background: url(../images/homepage_icon.png) -183px -396px  no-repeat; height:20px; display:block; padding-left:20px; color:#888888;}