diff --git a/app/controller/api/store/merchant/Merchant.php b/app/controller/api/store/merchant/Merchant.php
index dfe045c1..a4ff6061 100644
--- a/app/controller/api/store/merchant/Merchant.php
+++ b/app/controller/api/store/merchant/Merchant.php
@@ -67,7 +67,7 @@ class Merchant extends BaseController
            if($arr){
                 $category_id=Db::name('merchant_category')->whereIn('category_name',$arr)->column('merchant_category_id');
                 if($category_id){
-                    $where['category_id']=explode(',',$category_id);
+                    $where['category_id']=implode(',',$category_id);
                 }
            }
            unset($where['store_category_id']);