diff --git a/app/controllers/homework_common_controller.rb b/app/controllers/homework_common_controller.rb
index 00b11323b..ba6c136bb 100644
--- a/app/controllers/homework_common_controller.rb
+++ b/app/controllers/homework_common_controller.rb
@@ -17,9 +17,9 @@ class HomeworkCommonController < ApplicationController
     @page = params[:page] ? params[:page].to_i + 1 : 0
     @is_teacher = User.current.logged? && (User.current.admin? || User.current.allowed_to?(:as_teacher,@course))
     if @is_teacher
-      @homeworks = @course.homework_commons.order("created_at desc").limit(10).offset(@page * 10)
+      @homeworks = @course.homework_commons.order("updated_at desc").limit(10).offset(@page * 10)
     else
-      @homeworks = @course.homework_commons.where("publish_time <= '#{Date.today}'").order("created_at desc").limit(10).offset(@page * 10)
+      @homeworks = @course.homework_commons.where("publish_time <= '#{Date.today}'").order("updated_at desc").limit(10).offset(@page * 10)
     end
     @is_student = User.current.logged? && (User.current.admin? || (User.current.member_of_course?(@course) && !@is_teacher))
     @is_new = params[:is_new]
diff --git a/app/controllers/student_work_controller.rb b/app/controllers/student_work_controller.rb
index a38d83851..0c8bb6c01 100644
--- a/app/controllers/student_work_controller.rb
+++ b/app/controllers/student_work_controller.rb
@@ -303,6 +303,7 @@ class StudentWorkController < ApplicationController
             stu_project.save
           end
         end
+        @homework.update_attributes(:updated_at => Time.now)
         update_course_activity(@homework.class,@homework.id)
         update_user_activity(@homework.class,@homework.id)
         update_org_activity(@homework.class,@homework.id)
@@ -500,6 +501,10 @@ class StudentWorkController < ApplicationController
         when 3 #学生评分 学生评分显示平均分
           @work.student_score = @work.student_works_scores.where(:reviewer_role => 3).average(:score).try(:round, 2).to_f
       end
+      @homework.update_attributes(:updated_at => Time.now)
+      update_course_activity(@homework.class,@homework.id)
+      update_user_activity(@homework.class,@homework.id)
+      update_org_activity(@homework.class,@homework.id)
       if @work.save
         respond_to do |format|
           format.js
diff --git a/app/controllers/users_controller.rb b/app/controllers/users_controller.rb
index 921262106..ea984aa80 100644
--- a/app/controllers/users_controller.rb
+++ b/app/controllers/users_controller.rb
@@ -58,6 +58,7 @@ class UsersController < ApplicationController
   helper :sort
   helper :attachments
   include SortHelper
+  include ApplicationHelper
   helper :custom_fields
   include CustomFieldsHelper
   include AvatarHelper
@@ -690,6 +691,11 @@ class UsersController < ApplicationController
       end
 
       student_work.save
+      homework.update_attributes(:updated_at => Time.now)
+      update_course_activity(homework.class,homework.id)
+      update_user_activity(homework.class,homework.id)
+      update_org_activity(homework.class,homework.id)
+
       flash[:notice] = l(:notice_successful_create)
       redirect_to student_work_index_url(:homework => params[:homework])
     else
diff --git a/app/controllers/words_controller.rb b/app/controllers/words_controller.rb
index d1aa67483..e6d1d9117 100644
--- a/app/controllers/words_controller.rb
+++ b/app/controllers/words_controller.rb
@@ -276,7 +276,7 @@ class WordsController < ApplicationController
             ids = params[:asset_id].split(',')
             update_kindeditor_assets_owner ids,feedback[:id],OwnerTypeHelper::JOURNALSFORMESSAGE
           end
-
+          @homework_common.update_attributes(:updated_at => Time.now)
           update_course_activity(@homework_common.class,@homework_common.id)
           update_user_activity(@homework_common.class,@homework_common.id)
           update_org_activity(@homework_common.class,@homework_common.id)
diff --git a/db/migrate/20160309024051_update_homework_common_updated_at.rb b/db/migrate/20160309024051_update_homework_common_updated_at.rb
new file mode 100644
index 000000000..89a0e992d
--- /dev/null
+++ b/db/migrate/20160309024051_update_homework_common_updated_at.rb
@@ -0,0 +1,18 @@
+class UpdateHomeworkCommonUpdatedAt < ActiveRecord::Migration
+  def up
+    count = HomeworkCommon.all.count / 30 + 2
+    transaction do
+      for i in 1 ... count do i
+        HomeworkCommon.page(i).per(30).each do |hw|
+          ca = CourseActivity.where("course_act_type = 'HomeworkCommon' and course_act_id = #{hw.id}").first
+          unless ca.nil?
+            hw.update_attributes(:updated_at => ca.updated_at)
+          end
+        end
+      end
+    end
+  end
+
+  def down
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index a7ffc23b1..5bc8b1ea0 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -11,7 +11,7 @@
 #
 # It's strongly recommended to check this file into your version control system.
 
-ActiveRecord::Schema.define(:version => 20160304234903) do
+ActiveRecord::Schema.define(:version => 20160309024051) do
 
   create_table "activities", :force => true do |t|
     t.integer  "act_id",                                  :null => false
@@ -1387,6 +1387,7 @@ ActiveRecord::Schema.define(:version => 20160304234903) do
     t.integer  "changeset_num",     :default => 0
     t.integer  "board_message_num", :default => 0
     t.integer  "board_num",         :default => 0
+    t.integer  "act_num",           :default => 0
     t.integer  "attach_num",        :default => 0
     t.datetime "commit_time"
   end