diff --git a/app/controllers/zipdown_controller.rb b/app/controllers/zipdown_controller.rb
index 386e5733d..d9a9e1def 100644
--- a/app/controllers/zipdown_controller.rb
+++ b/app/controllers/zipdown_controller.rb
@@ -10,14 +10,14 @@ class ZipdownController < ApplicationController
   #勿删 before_filter :authorize, :only => [:assort,:download_user_homework]
   SAVE_FOLDER = "#{Rails.root}/files"
   OUTPUT_FOLDER = "#{Rails.root}/files/archiveZip"
+  MAX_PATH = 50
 
   #统一下载功能 
   def download
     if User.current.logged?
       begin
         if params[:base64file]
-          file = Base64.decode64(params[:base64file])
-          file = file.sub('*', '+')
+          file = decode64(params[:base64file])
           send_file "#{OUTPUT_FOLDER}/#{file}", :filename => filename_for_content_disposition(file), :type => detect_content_type(file)
         else
           send_file "#{OUTPUT_FOLDER}/#{params[:file]}", :filename => filename_for_content_disposition(params[:filename]), :type => detect_content_type(params[:file])
@@ -125,7 +125,11 @@ class ZipdownController < ApplicationController
   end
 
   def encode64(str)
-    Base64.encode64(str).sub('+', '*')
+    Base64.urlsafe_encode64(str)
+  end
+
+  def decode64(str)
+    Base64.urlsafe_decode64(str)
   end
 
   def zip_homework_common homework_common
@@ -242,6 +246,12 @@ class ZipdownController < ApplicationController
 
   def zipping(zip_name_refer, files_paths, output_path, is_attachment=false, not_exist_file=[])
     rename_zipfile = zip_name_refer ||= "#{Time.now.to_i.to_s}.zip"
+    # 文件名过长
+
+    if rename_zipfile.size > MAX_PATH
+      rename_zipfile = rename_zipfile[0,rename_zipfile.size-4][0,MAX_PATH-4] + rename_zipfile[-4,4]
+    end
+
     zipfile_name = "#{output_path}/#{rename_zipfile}"
 
     Dir.mkdir(File.dirname(zipfile_name)) unless File.exist?(File.dirname(zipfile_name))