diff --git a/app/controllers/attachments_controller.rb b/app/controllers/attachments_controller.rb
index 5c3503718..31463d691 100644
--- a/app/controllers/attachments_controller.rb
+++ b/app/controllers/attachments_controller.rb
@@ -64,7 +64,7 @@ class AttachmentsController < ApplicationController
     # modify by nwb
     # 下载添加权限设置
      candown = false
-    if (@attachment.container.has_attribute?(:project) || @attachment.container.has_attribute?(:project_id)) && @attachment.container.project
+    if @attachment.container.class.to_s != "HomeworkAttach" && (@attachment.container.has_attribute?(:project) || @attachment.container.has_attribute?(:project_id)) && @attachment.container.project
       project = @attachment.container.project
       candown= User.current.member_of?(project) || (project.is_public && @attachment.is_public == 1)
     elsif  @attachment.container.is_a?(Project)