diff --git a/app/controllers/attachments_controller.rb b/app/controllers/attachments_controller.rb
index 36dd61105..0f29d6000 100644
--- a/app/controllers/attachments_controller.rb
+++ b/app/controllers/attachments_controller.rb
@@ -26,6 +26,7 @@ class AttachmentsController < ApplicationController
   accept_api_auth :show, :download, :upload
   require 'iconv'
 
+
   def show
     respond_to do |format|
       format.html {
@@ -41,6 +42,13 @@ class AttachmentsController < ApplicationController
           render :action => 'diff'
         elsif @attachment.is_text? && @attachment.filesize <= Setting.file_max_size_displayed.to_i.kilobyte
           @content = File.new(@attachment.diskfile, "rb").read
+          # 编码为非 UTF-8先进行间接转码
+          # 部分unicode编码不直接支持转为 UTF-8
+          # modify by nwb
+          if @content.encoding.name != 'UTF-8'
+            @content = @content.force_encoding('GBK')
+            @content = @content.encode('UTF-8')
+          end
           render :action => 'file'
         else
           download