diff --git a/model.go b/model.go
index 45d42fe..8f20df1 100644
--- a/model.go
+++ b/model.go
@@ -261,7 +261,7 @@ func (m *Model) Fields() []*schema.Field {
 // 权限示例: "module.model.scenario"
 // 比如: organize:user:list, organize:user:create
 func (m *Model) Permission(scenario string) string {
-	ss := make([]string, 4)
+	ss := make([]string, 0, 4)
 	switch scenario {
 	case types.ScenarioList:
 		ss = append(ss, m.naming.ModuleName, m.naming.Singular, "list")
@@ -283,7 +283,7 @@ func (m *Model) Permission(scenario string) string {
 
 // Uri 获取请求的uri
 func (m *Model) Uri(scenario string) string {
-	ss := make([]string, 4)
+	ss := make([]string, 0, 4)
 	if m.urlPrefix != "" {
 		ss = append(ss, m.urlPrefix)
 	}