diff --git a/app/controllers/courses_controller.rb b/app/controllers/courses_controller.rb
index aa66dd7a0..71715035e 100644
--- a/app/controllers/courses_controller.rb
+++ b/app/controllers/courses_controller.rb
@@ -124,47 +124,47 @@ class CoursesController < ApplicationController
       @course_pages = Paginator.new @course_count, per_page_option, params['page']
 
       # 课程的动态数
-      @course_activity_count=Hash.new
-      @courses_all.each do |course|
-        @course_activity_count[course.id]=0
-      end
-
-      case params[:course_sort_type]
-        when '0'
-          @courses =  @courses_all.order("created_at desc")
-          @s_type = 0
-          @courses =  @courses.offset(@course_pages.offset).limit(@course_pages.per_page)
-
-          @course_activity_count=get_course_activity @courses,@course_activity_count
-
-        when '1'
-          @courses = @courses_all.order("course_ac_para desc")
-          @s_type = 1
-          @courses =  @courses.offset(@course_pages.offset).limit(@course_pages.per_page)
-
-          @course_activity_count=get_course_activity @courses,@course_activity_count
-
-        when '2'
-          @courses = @courses_all.order("watchers_count desc")
-          @s_type = 2
-          @courses =  @courses.offset(@course_pages.offset).limit(@course_pages.per_page)
-
-          @course_activity_count=get_course_activity @courses,@course_activity_count
-
-        when '3'
-          @course_activity_count=get_course_activity @courses_all,@course_activity_count_array
-          @courses=handle_course @courses_all,@course_activity_count
-          @s_type = 3
-          @courses =  @courses[@course_pages.offset, @course_pages.per_page]
-
-        else
-          @s_type = 0
-          @courses = @courses_all.order("created_at desc")
-          @courses =  @courses.offset(@course_pages.offset).limit(@course_pages.per_page)
-
-          @course_activity_count=get_course_activity @courses,@course_activity_count
-
-      end
+      # @course_activity_count=Hash.new
+      # @courses_all.each do |course|
+      #   @course_activity_count[course.id]=0
+      # end
+      #
+      # case params[:course_sort_type]
+      #   when '0'
+      #     @courses =  @courses_all.order("created_at desc")
+      #     @s_type = 0
+      #     @courses =  @courses.offset(@course_pages.offset).limit(@course_pages.per_page)
+      #
+      #     @course_activity_count=get_course_activity @courses,@course_activity_count
+      #
+      #   when '1'
+      #     @courses = @courses_all.order("course_ac_para desc")
+      #     @s_type = 1
+      #     @courses =  @courses.offset(@course_pages.offset).limit(@course_pages.per_page)
+      #
+      #     @course_activity_count=get_course_activity @courses,@course_activity_count
+      #
+      #   when '2'
+      #     @courses = @courses_all.order("watchers_count desc")
+      #     @s_type = 2
+      #     @courses =  @courses.offset(@course_pages.offset).limit(@course_pages.per_page)
+      #
+      #     @course_activity_count=get_course_activity @courses,@course_activity_count
+      #
+      #   when '3'
+      #     @course_activity_count=get_course_activity @courses_all,@course_activity_count_array
+      #     @courses=handle_course @courses_all,@course_activity_count
+      #     @s_type = 3
+      #     @courses =  @courses[@course_pages.offset, @course_pages.per_page]
+      #
+      #   else
+      #     @s_type = 0
+      #     @courses = @courses_all.order("created_at desc")
+      #     @courses =  @courses.offset(@course_pages.offset).limit(@course_pages.per_page)
+      #
+      #     @course_activity_count=get_course_activity @courses,@course_activity_count
+      #
+      # end
     end
 
     respond_to do |format|
diff --git a/app/views/courses/_course.html.erb b/app/views/courses/_course.html.erb
index 0b879f905..889319d5e 100644
--- a/app/views/courses/_course.html.erb
+++ b/app/views/courses/_course.html.erb
@@ -61,8 +61,8 @@
 
 	<!--gcm-->
 	<p class="stats">
-		<%= content_tag('span',  link_to("#{course_activity_count @course}", course_path(@course)), :class => "info") %>
-		<%= content_tag('span',  l(:label_x_activity, :count => @course_activity_count[@course.id])) %>
+		<%= content_tag('span',  link_to("#{@course.course_activities.count}", course_path(@course)), :class => "info") %>
+		<%= content_tag('span',  l(:label_x_activity, :count => @course.course_activities.count)) %>
 	</p>
 	<!--gcm-->