diff --git a/app/helpers/watchers_helper.rb b/app/helpers/watchers_helper.rb
index c0468e067..3f0149151 100644
--- a/app/helpers/watchers_helper.rb
+++ b/app/helpers/watchers_helper.rb
@@ -55,7 +55,7 @@ module WatchersHelper
     url_f = try_join_path(:object_id => course.id)
     method = joined ? 'delete' : 'post'
     if joined
-      link_to text, url_t, :remote => true, :method => method, :id => 'join', :confirm => l(:text_are_you_sure), :class => []+options
+      link_to text, url_t, :remote => true, :method => method, :id => 'join', :confirm => l(:text_are_you_sure_out), :class => []+options
     else
       link_to text, url_f, :remote => true, :method => method, :id => 'join', :class => []+options
     end       
diff --git a/app/views/users/_course_form.html.erb b/app/views/users/_course_form.html.erb
index ce8c6bb9d..610c9e633 100644
--- a/app/views/users/_course_form.html.erb
+++ b/app/views/users/_course_form.html.erb
@@ -12,7 +12,11 @@
 								<span>																			
 																				
 								</span>
-								<span style="float: right"><%= join_in_course(membership.project, User.current)%>&nbsp;&nbsp;&nbsp;&nbsp;<%= l(:label_x_base_courses_member, :count => membership.project.members.count) %>(<%= link_to "#{membership.project.members.count}", project_member_path(membership.project), :course =>'1' %>)&nbsp;&nbsp;
+								<span style="float: right">
+									<% unless membership.roles.first.to_s == 'Manager' %>
+									<%= join_in_course(membership.project, User.current)%>&nbsp;&nbsp;&nbsp;&nbsp;
+									<% end %>
+									<%= l(:label_x_base_courses_member, :count => membership.project.members.count) %>(<%= link_to "#{membership.project.members.count}", project_member_path(membership.project), :course =>'1' %>)&nbsp;&nbsp;
 									<%= l(:label_homework) %> (<span class=""><%= link_to (membership.project.homeworks.count), {:controller => 'projects', :action => 'homework', :id => membership.project.identifier} %></span>)
 								&nbsp;&nbsp;
 								<%= l(:label_course_news)%> (<span style="color: #ed8924"><%= link_to (membership.project.news.count), {:controller => 'news', :action => 'index', :project_id => membership.project.identifier} %></span>)
diff --git a/config/locales/zh.yml b/config/locales/zh.yml
index 09a01f7ad..4c629d6f1 100644
--- a/config/locales/zh.yml
+++ b/config/locales/zh.yml
@@ -964,6 +964,7 @@ zh:
   text_subprojects_destroy_warning: "以下子项目也将被同时删除：%{value}"
   text_workflow_edit: 选择角色和跟踪标签来编辑工作流程
   text_are_you_sure: 您确定要删除吗？
+  text_are_you_sure_out: 你确定要退出该课程吗？
   text_journal_changed: "%{label} 从 %{old} 变更为 %{new}"
   text_journal_set_to: "%{label} 被设置为 %{value}"
   text_journal_deleted: "%{label} 已删除 (%{old})"