diff --git a/app/controllers/attachments_controller.rb b/app/controllers/attachments_controller.rb
index 0c9c49621..a4ceeac09 100644
--- a/app/controllers/attachments_controller.rb
+++ b/app/controllers/attachments_controller.rb
@@ -18,9 +18,9 @@ class AttachmentsController < ApplicationController
 
     pdf_attachment = params[:disposition] || "attachment"
     if pdf_attachment == "inline"
-      send_file absolute_path(local_path(@file)),filename: @file.filename, disposition: 'inline',type: 'application/pdf'
+      send_file absolute_path(local_path(@file)),filename: @file.title, disposition: 'inline',type: 'application/pdf'
     else
-      send_file(absolute_path(local_path(@file)), filename: @file.filename,stream:false, type: @file.content_type.presence || 'application/octet-stream')
+      send_file(absolute_path(local_path(@file)), filename: @file.title,stream:false, type: @file.content_type.presence || 'application/octet-stream')
     end
     update_downloads(@file)
   end
diff --git a/app/models/attachment.rb b/app/models/attachment.rb
index 37884e40b..a918f4e0a 100644
--- a/app/models/attachment.rb
+++ b/app/models/attachment.rb
@@ -27,12 +27,21 @@ class Attachment < ApplicationRecord
 
   validates_length_of :description, maximum: 100
 
+  DCODES = %W(2 3 4 5 6 7 8 9 a b c f e f g h i j k l m n o p q r s t u v w x y z)
+
   def diskfile
     File.join(File.join(Rails.root, "files"), disk_directory.to_s, disk_filename.to_s)
   end
 
   def title
-    filename
+    title = filename
+    if container.is_a?(StudentWork) && author_id != User.current.id
+      course = container&.homework_common&.course
+      unless User.current.teacher_of_course?(course)
+        title = "#{Time.now.strftime('%Y%m%d%H%M%S')}_#{DCODES.sample(8).join}" + File.extname(filename)
+      end
+    end
+    title
   end
 
   def downloads_count
diff --git a/app/models/competition.rb b/app/models/competition.rb
index 23fa268ec..96fd14c1c 100644
--- a/app/models/competition.rb
+++ b/app/models/competition.rb
@@ -165,7 +165,7 @@ class Competition < ApplicationRecord
 
   def get_module_name type
     case type
-    when 'home'     then '首页'
+    when 'home'     then '赛制介绍'
     when 'enroll'   then '报名'
     when 'inform'   then '通知公告'
     when 'chart'    then '排行榜'
diff --git a/app/views/student_works/show.json.jbuilder b/app/views/student_works/show.json.jbuilder
index 9bafbe93e..7b3a91b5e 100644
--- a/app/views/student_works/show.json.jbuilder
+++ b/app/views/student_works/show.json.jbuilder
@@ -11,7 +11,7 @@ json.update_user_name @is_evaluation ? "匿名" : @work.update_user.try(:real_na
 json.update_atta @homework.late_duration && @is_author
 
 json.attachments @attachments do |atta|
-  json.partial! "attachments/attachment_simple", locals: {attachment: atta, delete: false}
+  json.partial! "attachments/attachment_simple", locals: {attachment: atta, delete: false, }
 end
 
 unless @is_evaluation