diff --git a/application/controllers/cache.php b/application/controllers/cache.php
index 21462e41..6cc027ca 100644
--- a/application/controllers/cache.php
+++ b/application/controllers/cache.php
@@ -151,9 +151,9 @@ class Cache extends CI_Controller
             {
                 if ($f!='.' && $f!='..' && (strpos($dir, '/cn/')===false) && (strpos($dir, '/amp/')===false) && (strpos($f, '.pdf')===false))
                 {
-                    $encode_f = mb_detect_encoding($f, array('ASCII','UTF-8','GB2312','GBK','BIG5'));
+                    $encode_f = mb_detect_encoding($f);
                     $_f = mb_convert_encoding ($f, 'UTF-8', $encode_f);
-                    $encode_d = mb_detect_encoding($dir, array('ASCII','UTF-8','GB2312','GBK','BIG5'));
+                    $encode_d = mb_detect_encoding($dir);
                     $_dir = mb_convert_encoding ($dir, 'UTF-8', $encode_d);
                     echo($encode_f.'@@@'.$encode_d);