diff --git a/app/controllers/courses_controller.rb b/app/controllers/courses_controller.rb
index a14ade71a..326ae0f42 100644
--- a/app/controllers/courses_controller.rb
+++ b/app/controllers/courses_controller.rb
@@ -205,7 +205,12 @@ class CoursesController < ApplicationController
     @is_remote = true
     q = "#{params[:name].strip}"
       #(redirect_to stores_url, :notice => l(:label_sumbit_empty);return) if params[:name].blank?
-    @results = searchStudent_by_name(@course, q)
+    if params[:incourse]
+      @results = searchStudent_by_name(@course, q)
+    elsif params[:ingroup]
+      @group = CourseGroup.find(params[:search_group_id])
+      @results = searchgroupstudent_by_name(@group, @course, q)
+    end
     @result_count = @results.count
     @results = paginateHelper @results
 
@@ -226,6 +231,16 @@ class CoursesController < ApplicationController
     @course_groups = @course.course_groups
   end
 
+  def deletegroup
+    CourseGroup.delete(params[:group_id])
+    @subPage_title = l :label_student_list
+    @canShowCode = isCourseTeacher(User.current.id,@course) && params[:role] != '1'
+    @is_remote = true
+    @members = searchStudent(@course)
+    @membercount = @members.count
+    @course_groups = @course.course_groups
+  end
+
   def updategroupname
     @subPage_title = l :label_student_list
     if params[:group_name]
diff --git a/app/helpers/courses_helper.rb b/app/helpers/courses_helper.rb
index 3b7e811f6..a1199a55a 100644
--- a/app/helpers/courses_helper.rb
+++ b/app/helpers/courses_helper.rb
@@ -184,6 +184,18 @@ module CoursesHelper
     end
     members
   end
+  def searchgroupstudent_by_name(group, project, name)
+    members = []
+    group.members.each do |m|
+      if m && m.user && m.user.allowed_to?(:as_student,project)
+        username = m.user[:lastname].to_s + m.user[:firstname].to_s
+        if(m.user[:login].to_s.include?(name) ||  m.user.user_extensions[:student_id].to_s.include?(name) || username.include?(name))
+          members << m
+        end
+      end
+    end
+    members
+  end
   def searchStudent_by_group  group, project
     #searchPeopleByRoles(project, StudentRoles)
     members = []
diff --git a/app/views/courses/_groups_name.html.erb b/app/views/courses/_groups_name.html.erb
index 096e84372..ca0fed9c2 100644
--- a/app/views/courses/_groups_name.html.erb
+++ b/app/views/courses/_groups_name.html.erb
@@ -1,40 +1,4 @@
-<script type=" text/javascript" charset="utf-8">
-    function validate_groupname(value1) {
 
-        if(value1.length > 20) {
-            alert('<%= l(:label_limit_groupname) %>');
-        }
-    }
-    function checkclass(value) {
-
-        for(var i = 0; i < document.getElementsByName("check_group_name").length; i++) {
-            if(document.getElementsByName("check_group_name")[i].id == value) {
-                document.getElementById(value).className = "selected";
-            }
-            else {
-                document.getElementsByName("check_group_name")[i].className = "classbox";
-            }
-
-        }
-    }
-    function validate_groupname_null(value1) {
-         value1 = value1.trim();
-        if(value1.length == 0 ) {
-            alert('<%= l(:label_limit_groupname_null) %>');
-        }
-    }
-    function validate_update(name) {
-         value1 = document.getElementById(name).value;
-        validate_groupname(value1);
-
-    }
-    function validate_add_group() {
-         value1 = document.getElementById('group_name').value;
-        validate_groupname(value1);
-        validate_groupname_null(value1);
-
-    }
-</script>
 
 
     <ul>
@@ -48,6 +12,13 @@
       <li class="classbox" id="group_name_<%= group.id %>" name="check_group_name">
         <%= link_to group_display, searchgroupmembers_course_path(@course,:group_id => group.id), method: 'get', remote: true,
                     :onclick => "checkclass('group_name_#{group.id}')",:style => " border:0px; color: #0d90c3; float:left;"%>
+        <% if @canShowCode && group.members.count == 0 %>
+            <%= link_to '', deletegroup_course_path(:group_id => group.id), :method => 'delete', :remote => true,
+                        :data => {confirm: l(:label_delete_group)},
+                        :class => 'f_1',
+                        :style => "width: 16px;height: 21px;margin-top:3px;margin-left:5px;background: url(/images/pic_del.gif) no-repeat 0 0;"
+            %>
+        <% end %>
         <% if @canShowCode %>
         <a href="javascript:void(0)" class="f_l" onclick="$('#add_tag_<%= group.id %>').slideToggle();"><img src="/images/pic_edit.png" width="14" height="15" alt="编辑班级" /></a>
         <% end %>
diff --git a/app/views/courses/_member_list.html.erb b/app/views/courses/_member_list.html.erb
index c707487a7..cdea592b4 100644
--- a/app/views/courses/_member_list.html.erb
+++ b/app/views/courses/_member_list.html.erb
@@ -6,9 +6,14 @@
     <span style="font-size: 18px; float: left; margin-right: 35px"><%= l(:label_current_group)%>:&nbsp;<%= @group.name %></span>
   <% end %>
   <% if @subPage_title && @subPage_title == l(:label_student_list)%>
+  <% if  @subPage_title == l(:label_student_list) %>
       <%= form_tag( searchmembers_course_path(@course), method: 'get',:class => "f_l",:style => "margin-left: 5px; ",:remote=>true) do %>
           <%= text_field_tag 'name', params[:name], name: "name", :class => 'f_1', :style => "height:15px"%>
-          <%= submit_tag l(:label_search), :class => "f_2"%>
+          <% if @group %>
+              <%= hidden_field "search_group_id", params[:search_group_id],:value => "#{@group.id}", name: 'search_group_id' %>
+             <%= submit_tag l(:label_search_member_in_group), :name => "ingroup",:class => "f_2"%>
+          <% end %>
+          <%= submit_tag l(:label_search_member_in_course), :name => 'incourse',:onclick => "checkclass('group_name_0')",:class => "f_2"%>
           <%#= link_to l(:label_search),'' , :class => 'f_2' %>
       <% end %>
   <% end %>
diff --git a/app/views/courses/deletegroup.js.erb b/app/views/courses/deletegroup.js.erb
new file mode 100644
index 000000000..a6f6933b9
--- /dev/null
+++ b/app/views/courses/deletegroup.js.erb
@@ -0,0 +1 @@
+$("#st_groups").html("<%= escape_javascript(  render :partial => 'groups_name', locals: {:course_groups => @course_groups})%>");
\ No newline at end of file
diff --git a/app/views/courses/member.html.erb b/app/views/courses/member.html.erb
index fb317acf6..b426e4a3e 100644
--- a/app/views/courses/member.html.erb
+++ b/app/views/courses/member.html.erb
@@ -1,3 +1,40 @@
+<script type=" text/javascript" charset="utf-8">
+    function validate_groupname(value1) {
+
+        if(value1.length > 20) {
+            alert('<%= l(:label_limit_groupname) %>');
+        }
+    }
+    function checkclass(value) {
+
+        for(var i = 0; i < document.getElementsByName("check_group_name").length; i++) {
+            if(document.getElementsByName("check_group_name")[i].id == value) {
+                document.getElementById(value).className = "selected";
+            }
+            else {
+                document.getElementsByName("check_group_name")[i].className = "classbox";
+            }
+
+        }
+    }
+    function validate_groupname_null(value1) {
+        value1 = value1.trim();
+        if(value1.length == 0 ) {
+            alert('<%= l(:label_limit_groupname_null) %>');
+        }
+    }
+    function validate_update(name) {
+        value1 = document.getElementById(name).value;
+        validate_groupname(value1);
+
+    }
+    function validate_add_group() {
+        value1 = document.getElementById('group_name').value;
+        validate_groupname(value1);
+        validate_groupname_null(value1);
+
+    }
+</script>
 <%= stylesheet_link_tag  'course_group', :media => 'all' %>
 <script type="text/javascript" src="javascripts/jquery-1.8.3-ui-1.9.2-ujs-2.0.3.js"></script>
 <div class="st_list">
diff --git a/config/locales/zh.yml b/config/locales/zh.yml
index 156880f13..236af39c1 100644
--- a/config/locales/zh.yml
+++ b/config/locales/zh.yml
@@ -570,8 +570,11 @@ zh:
   label_role_new: 新建角色
   label_role_and_permissions: 角色和权限
   label_member: 成员
+  label_search_member_in_group: 班内搜索
+  label_search_member_in_course: 课内搜索
   label_search_member_count: 共搜索到
   label_member_people: 人
+  label_delete_group: 确定删除分班？
   label_current_group: 当前分班
   label_limit_groupname: 组别名不能超出20字符
   label_limit_groupname_null: 组别名不能为空
diff --git a/config/routes.rb b/config/routes.rb
index 835e6be6e..45f3071b3 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -646,7 +646,8 @@ RedmineApp::Application.routes.draw do
       match "searchmembers", :controller => 'courses', :action => 'searchmembers', :via => [:post,:get]
       match "searchgroupmembers", :via => [:post, :get]
       match "updategroupname", :via => [:post, :get]
-      match "addgroups", :via => [:post, :get]
+      match "addgroups",  :via => [:post, :get]
+      match 'deletegroup', :via => [:delete]
       post 'join_in/join_group', :to => 'courses#join_group', :as => 'join_group'
       delete 'join_in/join_group', :to => 'courses#unjoin_group'
     end
diff --git a/public/images/pic_del.gif b/public/images/pic_del.gif
new file mode 100644
index 000000000..436fd1f92
Binary files /dev/null and b/public/images/pic_del.gif differ