diff --git a/app/libs/aliyun_vod/sign.rb b/app/libs/aliyun_vod/sign.rb
index 9706cc910..28f100acc 100644
--- a/app/libs/aliyun_vod/sign.rb
+++ b/app/libs/aliyun_vod/sign.rb
@@ -24,7 +24,7 @@ module AliyunVod::Sign
 
   def self.percent_encode(str)
     return '' if str.blank?
-    CGI::escape(str.to_s).gsub('/\+/','%20').gsub('/\*/','%2A').gsub('/%7E/','~')
+    CGI::escape(str.to_s).gsub(/\+/,'%20').gsub(/\*/,'%2A').gsub(/%7E/,'~')
   end
 
   def self.format_params(params)