diff --git a/app/controllers/homework_commons_controller.rb b/app/controllers/homework_commons_controller.rb
index 8fab8dad3..8e489df1b 100644
--- a/app/controllers/homework_commons_controller.rb
+++ b/app/controllers/homework_commons_controller.rb
@@ -1593,7 +1593,7 @@ class HomeworkCommonsController < ApplicationController
       homework_bank.max_num = homework.homework_detail_group.max_num
       homework_bank.base_on_project = homework.homework_detail_group.base_on_project
     end
-    homework.attachments.each do |attachment|
+    homework.attachments.where("attachtype != 2 and attachtype is null").each do |attachment|
       att = attachment.copy
       att.author_id = homework_bank.user_id
       att.copy_from = attachment.id