diff --git a/src/WorkerF/Http/Route.php b/src/WorkerF/Http/Route.php
index 4c39a27..bc8ac4e 100644
--- a/src/WorkerF/Http/Route.php
+++ b/src/WorkerF/Http/Route.php
@@ -369,6 +369,20 @@ protected static function _runDispatch(Requests $request, $callback, $middleware
         }
     }
 
+    /**
+     * Set variable route cache length limit.
+     *
+     * @param  int  $value
+     * @return void
+     */
+    public static function setVariableRouteCacheLimit($value)
+    {
+        if ( ! (is_numeric($value) && $value > 0)) {
+            throw new \InvalidArgumentException("The route cache limit need a numeric greater than 0 !");
+        }
+        self::$_variable_route_cache_limit = $value;
+    }
+
     /**
      * dispatch route.
      *
@@ -414,7 +428,7 @@ public static function dispatch(Requests $request)
             $callback           = $path_info['callback'];
             $params             = $path_info['params'];
             $middleware_symbols = $path_info['middleware'];
-            // clear route cache if data out of range
+            // clear route cache with LRU if data out of range
             self::_variableRouteCacheControl($path);
             // save variable route to cache
             self::$_variable_route_cache[$path][$method]['callback']   = $callback;
diff --git a/tests/Http/RouteTest.php b/tests/Http/RouteTest.php
index 41ed0e7..ae40f0f 100644
--- a/tests/Http/RouteTest.php
+++ b/tests/Http/RouteTest.php
@@ -36,6 +36,16 @@ public static function setVariableRouteCache($arr)
         self::$_variable_route_cache = $arr;
     }
 
+    public static function getVariableRouteCacheIndex()
+    {
+        return self::$_variable_route_cache_index;
+    }
+
+    public static function getVariableRouteCacheLimit()
+    {
+        return self::$_variable_route_cache_limit;
+    }
+
     public static function variableRouteCacheControl($value)
     {
         self::_variableRouteCacheControl($value);
@@ -663,6 +673,29 @@ public function testVariableRouteCacheControl()
         // $this->assertEquals(0, count($route_cache));
     }
 
+    public function testSetVariableRouteCacheLimit()
+    {
+        RouteFake::setVariableRouteCacheLimit(552);
+
+        $this->assertEquals(552, RouteFake::getVariableRouteCacheLimit());
+    }
+
+    /**
+    * @expectedException \InvalidArgumentException
+    */
+    public function testSetVariableRouteCacheLimitException()
+    {
+        RouteFake::setVariableRouteCacheLimit(-1);
+    }
+
+    /**
+    * @expectedException \InvalidArgumentException
+    */
+    public function testSetVariableRouteCacheLimitException2()
+    {
+        RouteFake::setVariableRouteCacheLimit(['a' => 1, 'b' => 2]);
+    }
+
     public function testGetRedirectUrl()
     {
         Config::set('app.base_url', 'http://test.com/');