diff --git a/lib/tasks/homework_git_file.rake b/lib/tasks/homework_git_file.rake
new file mode 100644
index 00000000..f8a5253a
--- /dev/null
+++ b/lib/tasks/homework_git_file.rake
@@ -0,0 +1,43 @@
+namespace :homework do
+  def tran_base64_decode64 str
+    if str.blank?
+      str
+    else
+      s_size = str.size % 4
+      if s_size != 0
+        str += "=" * (4 - s_size)
+      end
+      Base64.decode64(str.tr("-_", "+/")).force_encoding("utf-8")
+    end
+  end
+
+  task :gitfiledown => :environment do
+    begin
+      puts ENV['args']
+      system("tmp/homework_file") if File.exist?("tmp/homework_file")
+      homework_common =  HomeworkCommon.find(ENV['args'])
+      student_works = homework_common.student_works
+      student_works.each do |sw|
+        username = sw.user.try(:show_real_name)
+        myshixun = sw.try(:myshixun)
+        puts myshixun.try(:gpid)
+        if myshixun.try(:gpid)
+          content = g.files(myshixun.gpid, "PL/PL.cpp", "master").try(:content)
+          tran_content = tran_base64_decode64(content)
+          path = "tmp/homework_file/#{username}"
+          FileUtils.mkdir_p(path) unless File.exist?(path)
+          system("cd #{path}; touch PL.cpp")
+          aFile = File.new("#{path}/PL.cpp", "r+")
+          if aFile
+            aFile.syswrite(tran_content)
+          else
+            puts "Unable to open file!"
+          end
+        end
+      end
+    rescue Exception => e
+      Rails.logger.error(e.message)
+    end
+  end
+end
+