diff --git a/examples/complete/main.tf b/examples/complete/main.tf
index cc3ba6a..e17bf27 100644
--- a/examples/complete/main.tf
+++ b/examples/complete/main.tf
@@ -3,7 +3,7 @@ variable "profile" {
 }
 
 variable "region" {
-  default = "cn-hangzhou"
+  default = "cn-shanghai"
 }
 
 data "alicloud_vpcs" "default" {
diff --git a/main.tf b/main.tf
index d600fb9..22a8efc 100644
--- a/main.tf
+++ b/main.tf
@@ -43,9 +43,11 @@ resource "alicloud_vswitch" "vswitches" {
 }
 
 resource "alicloud_nat_gateway" "default" {
-  count  = var.new_nat_gateway == true ? 1 : 0
-  vpc_id = var.vpc_id == "" ? join("", alicloud_vpc.vpc.*.id) : var.vpc_id
-  name   = var.example_name
+  count      = var.new_nat_gateway == true ? 1 : 0
+  vpc_id     = var.vpc_id == "" ? join("", alicloud_vpc.vpc.*.id) : var.vpc_id
+  name       = var.example_name
+  nat_type   = var.nat_type
+  vswitch_id = length(var.vswitch_ids) > 0 ? split(",", join(",", var.vswitch_ids))[count.index % length(split(",", join(",", var.vswitch_ids)))] : length(var.vswitch_cidrs) < 1 ? "" : split(",", join(",", alicloud_vswitch.vswitches.*.id))[count.index % length(split(",", join(",", alicloud_vswitch.vswitches.*.id)))]
 }
 
 resource "alicloud_eip" "default" {
diff --git a/variables.tf b/variables.tf
index 42d2daa..c2d26b0 100644
--- a/variables.tf
+++ b/variables.tf
@@ -177,16 +177,26 @@ variable "k8s_service_cidr" {
 }
 
 variable "k8s_version" {
-  description = "The version of the kubernetes version.  Valid values: '1.16.6-aliyun.1','1.14.8-aliyun.1'. Default to '1.16.6-aliyun.1'."
+  description = "The version of the kubernetes version.  Valid values: 1.20.11-aliyun.1 1.18.8-aliyun.1."
   type        = string
-  default     = "1.16.6-aliyun.1"
+  default     = "1.20.11-aliyun.1"
 }
 
 variable "cluster_addons" {
-  description = "Addon components in kubernetes cluster"
-  type = list(object({
-    name   = string
-    config = string
+  description     = "Addon components in kubernetes cluster"
+  type            = list(object({
+         name     = string
+         config   = string
   }))
-  default = []
+  default         = [{
+         "name"   = "flannel",
+         "config" = "",
+      }
+  ]
+}
+
+variable "nat_type" {
+  description = "The type of NAT gateway.   Valid values: 'Enhanced'."
+  type        = string
+  default     = "Enhanced"
 }