diff --git a/app/controllers/members_controller.rb b/app/controllers/members_controller.rb
index 5435a2d61..daf11b33f 100644
--- a/app/controllers/members_controller.rb
+++ b/app/controllers/members_controller.rb
@@ -1,3 +1,4 @@
+# -*coding:utf-8 -*-
 # Redmine - project management software
 # Copyright (C) 2006-2013  Jean-Philippe Lang
 #
@@ -14,6 +15,7 @@
 # You should have received a copy of the GNU General Public License
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+
 class MembersController < ApplicationController
   model_object Member
   before_filter :find_model_object, :except => [:index, :create, :autocomplete]
@@ -124,7 +126,13 @@ class MembersController < ApplicationController
             attrs = params[:membership].dup
             user_ids = attrs.delete(:user_ids)
             user_ids.each do |user_id|
-              members << Member.new(:role_ids => params[:membership][:role_ids], :user_id => user_id)
+              member =  Member.new(:role_ids => params[:membership][:role_ids], :user_id => user_id)
+              role = Role.find_by_id(params[:membership][:role_ids])
+              # 这里的判断只能通过角色名，可以弄成常量
+              if role.name == "学生"
+                StudentsForCourse.create(:student_id => user_id, :course_id =>@course.id)
+              end
+              members << member
               #user_grades << UserGrade.new(:user_id => user_id, :course_id => @course.id)
               if (params[:membership][:role_ids])
                 role = Role.find(params[:membership][:role_ids][0])
@@ -201,6 +209,15 @@ class MembersController < ApplicationController
 
         if (params[:membership][:role_ids])
           role = Role.find(params[:membership][:role_ids][0])
+          # 这里的判断只能通过角色名，可以弄成常量
+          if role.name == "学生"
+            StudentsForCourse.create(:student_id => @member.user_id, :course_id =>@course.id)
+          else
+            joined = StudentsForCourse.where('student_id = ? and course_id = ?', @member.user_id,@course.id)
+            joined.each do |join|
+              join.delete
+            end
+          end
           if role.allowed_to?(:is_manager)
             @courseInfo = CourseInfos.new(:user_id => @member.user_id, :course_id => @course.id)
             @courseInfo.save
@@ -271,6 +288,11 @@ class MembersController < ApplicationController
             user.destroy
           end
         end
+        joined = StudentsForCourse.where('student_id = ? and course_id = ?', @member.user_id,@course.id)
+        joined.each do |join|
+          join.delete
+        end
+
       end
       respond_to do |format|
         format.html { redirect_to_settings_in_courses }