diff --git a/db/migrate/20140618020535_remove_data_to_homework_attach.rb b/db/migrate/20140618020535_remove_data_to_homework_attach.rb
new file mode 100644
index 000000000..16a1b4911
--- /dev/null
+++ b/db/migrate/20140618020535_remove_data_to_homework_attach.rb
@@ -0,0 +1,25 @@
+class RemoveDataToHomeworkAttach < ActiveRecord::Migration
+  def up
+    bidding_projects = BidingProject.joins(:bid).where("bids.reward_type = 3")
+    bidding_projects.each do |biding|
+      homework = HomeworkAttach.new
+      homework.project_id = biding.project_id
+      homework.bid_id = biding.bid_id
+      homework.created_at = biding.created_at
+      homework.updated_at = biding.updated_at
+      homework.reward = biding.reward
+      homework.description = biding.description
+      homework.user_id = biding.user_id
+      homework.state = 0
+      homework.save
+    end
+  end
+
+  def down
+    bidding_projects = BidingProject.joins(:bid).where("bids.reward_type = 3")
+    bidding_projects.each do |biding|
+      homework = HomeworkAttach.where("bid_id = #{biding.bid_id} and user_id = #{biding.user_id}")
+      homework.first.destroy
+    end
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index fc2151165..18cc2a718 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 => 20140617092219) do
+ActiveRecord::Schema.define(:version => 20140618020535) do
 
   create_table "activities", :force => true do |t|
     t.integer "act_id",   :null => false