diff --git a/library/think/cache/driver/File.php b/library/think/cache/driver/File.php
index 53a5ded6..29cd3773 100644
--- a/library/think/cache/driver/File.php
+++ b/library/think/cache/driver/File.php
@@ -38,8 +38,8 @@ class File
         if (!empty($options)) {
             $this->options = array_merge($this->options, $options);
         }
-        if (substr($this->options['path'], -1) != '/') {
-            $this->options['path'] .= '/';
+        if (substr($this->options['path'], -1) != DS) {
+            $this->options['path'] .= DS;
         }
         $this->init();
     }
@@ -74,7 +74,7 @@ class File
             $dir = '';
             $len = $this->options['path_level'];
             for ($i = 0; $i < $len; $i++) {
-                $dir .= $name{$i} . '/';
+                $dir .= $name{$i} . DS;
             }
             if (!is_dir($this->options['path'] . $dir)) {
                 mkdir($this->options['path'] . $dir, 0755, true);