diff --git a/library/think/loader.php b/library/think/loader.php
index cc0cfa80..8715da81 100644
--- a/library/think/loader.php
+++ b/library/think/loader.php
@@ -36,8 +36,8 @@ class Loader
             include $file;
         } else {
             // 命名空间自动加载
-            $name  = strtolower(strstr($class, '\\', true));
-            $class = substr($class, strlen($name) + 1);
+            list($name, $class) = explode('\\', $class, 2);
+            $name               = strtolower($name);
             if (isset(self::$namespace[$name])) {
                 // 注册的命名空间
                 $path = self::$namespace[$name];