diff --git a/ack-centos.json b/ack-centos.json
index 6a040ef..1ab37a3 100644
--- a/ack-centos.json
+++ b/ack-centos.json
@@ -3,7 +3,7 @@
     "region": "cn-hangzhou",
     "image_name": "test_image{{timestamp}}",
     "source_image": "centos_7_06_64_20G_alibase_20190711.vhd",
-    "instance_type": "ecs.n1.large",
+    "instance_type": "ecs.g6.large",
     "access_key": "{{env `ALICLOUD_ACCESS_KEY`}}",
     "secret_key": "{{env `ALICLOUD_SECRET_KEY`}}"
   },
diff --git a/examples/ack-centos-using-existing-vpc-vswitch.json b/examples/ack-centos-using-existing-vpc-vswitch.json
index 9910e5e..ccc2bb1 100644
--- a/examples/ack-centos-using-existing-vpc-vswitch.json
+++ b/examples/ack-centos-using-existing-vpc-vswitch.json
@@ -3,7 +3,7 @@
     "region": "cn-hangzhou",
     "image_name": "test_image{{timestamp}}",
     "source_image": "centos_7_06_64_20G_alibase_20190711.vhd",
-    "instance_type": "ecs.n1.large",
+    "instance_type": "ecs.g6.large",
     "vpc_id": "vpc-xxxxxx",
     "vswitch_id": "vsw-xxxxxx",
     "access_key": "{{env `ALICLOUD_ACCESS_KEY`}}",
diff --git a/examples/ack-centos.json b/examples/ack-centos.json
index e0b7de7..c3c6e24 100644
--- a/examples/ack-centos.json
+++ b/examples/ack-centos.json
@@ -3,7 +3,7 @@
     "region": "cn-hangzhou",
     "image_name": "test_image{{timestamp}}",
     "source_image": "centos_7_06_64_20G_alibase_20190711.vhd",
-    "instance_type": "ecs.n1.large",
+    "instance_type": "ecs.g6.large",
     "access_key": "{{env `ALICLOUD_ACCESS_KEY`}}",
     "secret_key": "{{env `ALICLOUD_SECRET_KEY`}}"
   },