diff --git a/tests/thinkphp/library/think/debugTest.php b/tests/thinkphp/library/think/debugTest.php
index 494694a3..36e1f049 100644
--- a/tests/thinkphp/library/think/debugTest.php
+++ b/tests/thinkphp/library/think/debugTest.php
@@ -82,7 +82,7 @@ class debugTest extends \PHPUnit_Framework_TestCase
     public function testGetUseTime()
     {
         $time = Debug::getUseTime();
-        $this->assertLessThan(20, $time);
+        $this->assertLessThan(30, $time);
     }
 
     /**