diff --git a/app/common/model/ProductSkuBaseModel.php b/app/common/model/ProductSkuBaseModel.php
index fba8df29..10546e25 100644
--- a/app/common/model/ProductSkuBaseModel.php
+++ b/app/common/model/ProductSkuBaseModel.php
@@ -21,7 +21,7 @@ class ProductSkuBaseModel extends BaseModel
         'product_id'  => 'int',
         'sku'         => 'string',
         'main_image'  => 'string',
-        'photo_album' => 'string',
+        'photo_album' => 'json',
         'sort'        => 'int',
         'created_at'  => 'datetime',
         'updated_at'  => 'datetime'