diff --git a/app/controllers/files_controller.rb b/app/controllers/files_controller.rb
index 1e1934ecf..35e27a87f 100644
--- a/app/controllers/files_controller.rb
+++ b/app/controllers/files_controller.rb
@@ -26,14 +26,15 @@ class FilesController < ApplicationController
   include SortHelper
 
   def index
-    sort_init 'filename', 'asc'
-    sort_update 'filename' => "#{Attachment.table_name}.filename",
-                'created_on' => "#{Attachment.table_name}.created_on",
-                'size' => "#{Attachment.table_name}.filesize",
-                'downloads' => "#{Attachment.table_name}.downloads"
-
-    @containers = [ Project.includes(:attachments).reorder(sort_clause).find(@project.id)]
-    @containers += @project.versions.includes(:attachments).reorder(sort_clause).all.sort.reverse
+    #sort_init 'filename', 'asc'
+    sort_init 'created_on', 'desc' 
+    sort_update   'created_on' => "#{Attachment.table_name}.created_on", 
+                  'filename' => "#{Attachment.table_name}.filename",
+                  'size' => "#{Attachment.table_name}.filesize",
+                  'downloads' => "#{Attachment.table_name}.downloads"
+   
+    @containers = [ Project.includes(:attachments).reorder("attachments.created_on DESC").find(@project.id)]     #modify by Long Jun
+    @containers += @project.versions.includes(:attachments).reorder("created_on DESC").all.sort
    
     if @project.project_type == 1
       render :layout => 'base_courses'