diff --git a/library/think/Route.php b/library/think/Route.php
index 4a4aa930..7d5faa76 100644
--- a/library/think/Route.php
+++ b/library/think/Route.php
@@ -1112,11 +1112,15 @@ class Route
 
             if (0 === strpos($val, '[:')) {
                 // 可选参数
-                $val = substr($val, 1, -1);
+                $val      = substr($val, 1, -1);
+                $optional = true;
             }
             if (0 === strpos($val, ':')) {
                 // URL变量
                 $name = substr($val, 1);
+                if (!isset($optional) && !isset($m1[$key])) {
+                    return false;
+                }
                 if (isset($m1[$key]) && isset($pattern[$name]) && !preg_match('/^' . $pattern[$name] . '$/', $m1[$key])) {
                     // 检查变量规则
                     return false;