diff --git a/app/api/mobile/entities/attachment.rb b/app/api/mobile/entities/attachment.rb
index b7424fac9..bb67b6d28 100644
--- a/app/api/mobile/entities/attachment.rb
+++ b/app/api/mobile/entities/attachment.rb
@@ -14,9 +14,10 @@ module Mobile
                 f.send(field)
               end
             else
-              #case field
-              #  when ""
-              #end
+              case field
+                when :file_dir
+                  "attachments/download/" << f.send(:id).to_s << '/'
+              end
             end
           end
         end
@@ -27,6 +28,7 @@ module Mobile
       attachment_expose :downloads
       attachment_expose :quotes
       attachment_expose :created_on
+      attachment_expose :file_dir
     end
   end
 end
\ No newline at end of file
diff --git a/app/services/courses_service.rb b/app/services/courses_service.rb
index 81cf339dd..7efe76b3a 100644
--- a/app/services/courses_service.rb
+++ b/app/services/courses_service.rb
@@ -434,24 +434,15 @@ class CoursesService
    # 课程课件
    def course_attachments params
      result = []
-     @course = Course.find(params[:course_id])
-     @attachments = @course.attachments.order("created_on desc")
+     course = Course.find(params[:course_id])
+     attachments = course.attachments.order("created_on ")
      if !params[:name].nil? && params[:name] != ""
-       @attachments.each do |atta|
-         result << {:filename => atta.filename,
-                    :description => atta.description,
-                    :downloads => atta.downloads,
-                    :quotes => atta.quotes.nil? ? 0 :atta.quotes  } if atta.filename.include?(params[:name])
+       attachments.each do |atta|
+         result << atta if atta.filename.include?(params[:name])
 
        end
      else
-       @attachments.each do |atta|
-         result << {:filename => atta.filename,
-                    :description => atta.description,
-                    :downloads => atta.downloads,
-                    :quotes => atta.quotes.nil? ? 0 :atta.quotes  }
-
-       end
+       result = attachments
      end
      result
    end