diff --git a/beike/Libraries/Weight.php b/beike/Libraries/Weight.php
index 47d3ec30..fa7eb41e 100644
--- a/beike/Libraries/Weight.php
+++ b/beike/Libraries/Weight.php
@@ -14,8 +14,8 @@ namespace Beike\Libraries;
 class Weight
 {
     public const WEIGHT_CLASS = [
-        'kg' => 0.001,
         'g'  => 1,
+        'kg' => 0.001,
         'oz' => 0.035,
         'lb' => 0.0022046,
     ];