diff --git a/main.tf b/main.tf
index e53d267..9121173 100644
--- a/main.tf
+++ b/main.tf
@@ -35,6 +35,7 @@ resource "alicloud_cen_instance_attachment" "vpc_attach_1" {
   instance_id              = local.cen_id
   child_instance_id        = var.vpc_id_1
   child_instance_region_id = var.child_instance_region_id_1
+  child_instance_type      = var.child_instance_type
 }
 
 resource "alicloud_cen_instance_attachment" "vpc_attach_2" {
@@ -42,6 +43,7 @@ resource "alicloud_cen_instance_attachment" "vpc_attach_2" {
   instance_id              = local.cen_id
   child_instance_id        = var.vpc_id_2
   child_instance_region_id = var.child_instance_region_id_2
+  child_instance_type      = var.child_instance_type
 }
 
 resource "alicloud_cen_bandwidth_limit" "this" {
@@ -55,4 +57,4 @@ resource "alicloud_cen_bandwidth_limit" "this" {
     "alicloud_cen_bandwidth_package_attachment.this",
     "alicloud_cen_instance_attachment.vpc_attach_1",
   "alicloud_cen_instance_attachment.vpc_attach_2"]
-}
\ No newline at end of file
+}
diff --git a/varibales.tf b/varibales.tf
index 4ee1b92..244dc58 100644
--- a/varibales.tf
+++ b/varibales.tf
@@ -132,6 +132,12 @@ variable "child_instance_region_id_2" {
   default     = ""
 }
 
+variable "child_instance_type" {
+  description = "The type of the child instance to attach."
+  type        = string
+  default     = "VPC"
+}
+
 #bandwidth limit
 variable "create_bandwidth_limit" {
   description = "Wether to create bandwidth limit,Default to true."
@@ -143,4 +149,4 @@ variable "bandwidth_limit" {
   description = " The bandwidth configured for the interconnected regions communication."
   type        = number
   default     = 4
-}
\ No newline at end of file
+}