diff --git a/library/think/Route.php b/library/think/Route.php
index e5711c33..47f9449d 100644
--- a/library/think/Route.php
+++ b/library/think/Route.php
@@ -1212,7 +1212,7 @@ class Route
                 $var += explode('/', $url);
             } else {
                 preg_replace_callback('/(\w+)\/([^\/]+)/', function ($match) use (&$var) {
-                    $var[strtolower($match[1])] = strip_tags($match[2]);
+                    $var[$match[1]] = strip_tags($match[2]);
                 }, $url);
             }
         }