diff --git a/pkg/service/approval.go b/pkg/service/approval.go
index e77b619..84cf180 100644
--- a/pkg/service/approval.go
+++ b/pkg/service/approval.go
@@ -312,7 +312,7 @@ func (a *ApprovalProvider) UpdateSetting(ctx context.Context, in *approval.Setti
 		fmt.Println(copyUsers == nil)
 		fmt.Println(copyUsers)
 		if copyUsers == nil { //空数组
-			model.DB.Exec("UPDATE approval_setting SET copy_users = `[]` WHERE id = ?", setting.ID)
+			model.DB.Exec("UPDATE approval_setting SET copy_users = '[]' WHERE id = ?", setting.ID)
 			//model.DB.Where(&model.ApprovalSetting{Domain: in.Domain, KeyWord: in.KeyWord}).Update("copy_users", "[]")
 		}