diff --git a/application/common.php b/application/common.php
index 9870a13..8d87e9a 100644
--- a/application/common.php
+++ b/application/common.php
@@ -880,7 +880,7 @@ function generateRandom($num = 0)
     }
     return $str;
 }
-function generateRandoms($length = 4)
+function generateRandoms($length = 6)
 {
     $min = pow(10, $length - 1);
     $max = pow(10, $length) - 1;