diff --git a/app/models/user_activity.rb b/app/models/user_activity.rb
new file mode 100644
index 000000000..1af1dc017
--- /dev/null
+++ b/app/models/user_activity.rb
@@ -0,0 +1,7 @@
+class UserActivity < ActiveRecord::Base
+  attr_accessible :act_type,:act_id,:container_type,:container_id
+  # 虚拟关联---项目动态表/课程动态表
+  belongs_to :act ,:polymorphic => true
+  # 虚拟关联---项目/课程
+  belongs_to :container ,:polymorphic => true
+end
diff --git a/db/migrate/20150820022416_create_user_activity.rb b/db/migrate/20150820022416_create_user_activity.rb
new file mode 100644
index 000000000..7d6a978d1
--- /dev/null
+++ b/db/migrate/20150820022416_create_user_activity.rb
@@ -0,0 +1,16 @@
+class CreateUserActivity < ActiveRecord::Migration
+  def up
+    create_table :user_activities do |t|
+      t.string :act_type
+      t.integer :act_id
+      t.string :container_type
+      t.integer :container_id
+
+      t.timestamps
+    end
+  end
+
+  def down
+    drop_table :user_activities
+  end
+end
diff --git a/db/migrate/20150820025358_about_user_activities.rb b/db/migrate/20150820025358_about_user_activities.rb
new file mode 100644
index 000000000..f3916cff3
--- /dev/null
+++ b/db/migrate/20150820025358_about_user_activities.rb
@@ -0,0 +1,37 @@
+class AboutUserActivities < ActiveRecord::Migration
+  def up
+    forge_count = ForgeActivity.all.count / 30 + 2
+    transaction do
+      for i in 1 ... forge_count do i
+        ForgeActivity.page(i).per(30).each do |activity|
+          user_activity = UserActivity.new
+          user_activity.act_id = activity.id
+          user_activity.act_type = activity.class.to_s
+          user_activity.container_type = "Project"
+          user_activity.container_id = activity.project_id
+          user_activity.created_at = activity.created_at
+          user_activity.save
+        end
+      end
+    end
+
+    course_count = CourseActivity.all.count / 30 + 2
+    transaction do
+      for i in 1 ... course_count do i
+      CourseActivity.page(i).per(30).each do |activity|
+        user_activity = UserActivity.new
+        user_activity.act_id = activity.id
+        user_activity.act_type = activity.class.to_s
+        user_activity.container_type = "Course"
+        user_activity.container_id = activity.course_id
+        user_activity.created_at = activity.created_at
+        user_activity.save
+      end
+      end
+    end
+  end
+
+  def down
+
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index 8d78a9ca0..7e3743b0e 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 => 20150815030833) do
+ActiveRecord::Schema.define(:version => 20150820025358) do
 
   create_table "activities", :force => true do |t|
     t.integer  "act_id",                                  :null => false
@@ -1394,6 +1394,15 @@ ActiveRecord::Schema.define(:version => 20150815030833) do
     t.integer "fields_bits",                 :default => 0
   end
 
+  create_table "user_activities", :force => true do |t|
+    t.string   "act_type"
+    t.integer  "act_id"
+    t.string   "container_type"
+    t.integer  "container_id"
+    t.datetime "created_at",     :null => false
+    t.datetime "updated_at",     :null => false
+  end
+
   create_table "user_extensions", :force => true do |t|
     t.integer  "user_id",                            :null => false
     t.date     "birthday"