diff --git a/app/controllers/student_works_controller.rb b/app/controllers/student_works_controller.rb
index ab62cbd45..2612510c5 100644
--- a/app/controllers/student_works_controller.rb
+++ b/app/controllers/student_works_controller.rb
@@ -321,11 +321,12 @@ class StudentWorksController < ApplicationController
 
     ActiveRecord::Base.transaction do
       begin
-        revise_attachment = @work.attachments.where(attachtype: 7).reorder("created_on desc").last
-        if revise_attachment.present? && @work.student_works_scores.where("created_at > '#{revise_attachment.created_on}'
-                                                                         and score is not null").count == 0
-          revise_attachment.destroy
-        end
+        # 补交作业附件不覆盖之前上传的附件
+        # revise_attachment = @work.attachments.where(attachtype: 7).reorder("created_on desc").last
+        # if revise_attachment.present? && @work.student_works_scores.where("created_at > '#{revise_attachment.created_on}'
+        #                                                                  and score is not null").count == 0
+        #   revise_attachment.destroy
+        # end
         Attachment.associate_container(params[:attachment_ids], @work.id, @work.class, 7)
         revise_attachment = Attachment.where(attachtype: 7, container_id: @work.id, container_type: "StudentWork").last
         revise_attachment.update_attributes(description: params[:description]) if revise_attachment.present?