diff --git a/app/controllers/courses_controller.rb b/app/controllers/courses_controller.rb
index e81b57ad7..7653be94d 100644
--- a/app/controllers/courses_controller.rb
+++ b/app/controllers/courses_controller.rb
@@ -828,6 +828,7 @@ class CoursesController < ApplicationController
   end
 
   def show
+
      # try to redirect to the requested menu item
     if params[:jump] && redirect_to_course_menu_item(@course, params[:jump])
       return
@@ -866,6 +867,7 @@ class CoursesController < ApplicationController
     @activity.scope_select {|t| has["show_#{t}"]}
     # modify by nwb
     # 添加私密性判断
+
     if User.current.member_of_course?(@course)|| User.current.admin?
       events = @activity.events(@days, @course.created_at)
     else
@@ -890,14 +892,13 @@ class CoursesController < ApplicationController
     @events_by_day = events.group_by {|event| User.current.time_to_date(event.event_datetime)}
     #  documents
     @sort_by = %w(category date title author).include?(params[:sort_by]) ? params[:sort_by] : 'category'
-    #
-    @teachers= searchTeacherAndAssistant(@course)
-    @canShowRealName = isCourseTeacher(User.current.id,@course)
+    # 这写变量发现没有用而且拖慢速度
+    #@teachers= searchTeacherAndAssistant(@course)
+    #@canShowRealName = isCourseTeacher(User.current.id,@course)
 
     if(User.find_by_id(CourseInfos.find_by_course_id(@course.id).try(:user_id)))
       @user = User.find_by_id(CourseInfos.find_by_course_id(@course.id).user_id)
     end
-
     respond_to do |format|
       format.html{render :layout => 'base_courses'}
       format.api