diff --git a/pkg/util/aws/instance.go b/pkg/util/aws/instance.go
index 7bde39d10e..1ceef457f2 100644
--- a/pkg/util/aws/instance.go
+++ b/pkg/util/aws/instance.go
@@ -326,7 +326,6 @@ func (self *SInstance) DeleteVM() error {
 	for {
 		err := self.host.zone.region.DeleteVM(self.InstanceId)
 		if err != nil {
-			// todo: implement me
 			return err
 		} else {
 			break
@@ -337,8 +336,7 @@ func (self *SInstance) DeleteVM() error {
 }
 
 func (self *SInstance) UpdateVM(name string) error {
-	// todo :implement me
-	return nil
+	return self.host.zone.region.UpdateVM(self.InstanceId, name)
 }
 
 func (self *SInstance) RebuildRoot(imageId string, passwd string, publicKey string, sysSizeGB int) (string, error) {
@@ -690,12 +688,11 @@ func (self *SRegion) DeployVM(instanceId string, name string, password string, k
 }
 
 func (self *SRegion) UpdateVM(instanceId string, hostname string) error {
-	// todo : implement me
-	return nil
+	// https://docs.aws.amazon.com/zh_cn/AWSEC2/latest/UserGuide/set-hostname.html
+	return fmt.Errorf("aws not support change hostname.")
 }
 
 func (self *SRegion) ReplaceSystemDisk(instanceId string, imageId string, passwd string, keypairName string, sysDiskSizeGB int) (string, error) {
-
 	return "", cloudprovider.ErrNotSupported
 }
 
diff --git a/pkg/util/aws/instancetype.go b/pkg/util/aws/instancetype.go
index a1ae366f64..2e728bf2b0 100644
--- a/pkg/util/aws/instancetype.go
+++ b/pkg/util/aws/instancetype.go
@@ -83,6 +83,8 @@ func (self *SRegion) GetMatchInstanceTypes(cpu int, memMB int, gpu int, zoneId s
 	}
 
 	// 实例类型顺序: 微型实例 -> 通用型 -> 计算优化型 ...
+	// todo：部分实例类型 需要启用ena才能正常启动。需要过滤掉。
+	// https://docs.aws.amazon.com/zh_cn/AWSEC2/latest/UserGuide/enhanced-networking-ena.html
 	ret := []SInstanceType{}
 	for _, t := range types {
 		// cpu & mem & disk & ena 都匹配才行