diff --git a/README.md b/README.md
index 01d60f7..128af94 100644
--- a/README.md
+++ b/README.md
@@ -46,6 +46,7 @@ Option Name                                          | Description
 ``--otc-ssh-user``|Instance's optional ssh user||
 ``--otc-subnet-id``|Subnet ID for your instance private network (Network ID)||
 ``--otc-tenant-id``|Tenant ID (Project ID)||
+``--otc-elastic-ip``|Set to 0 to not allocate an EIP (use private IP)||
 
 
 ## Environment variables and default values:
@@ -70,6 +71,7 @@ Option Name                                          | Description
 | `--otc-ssh-user`		| `SSH_USER`		| -                |
 | `--otc-subnet-id`		| `SUBNET_ID`		| -                |
 | `--otc-tenant-id`		| `TENANT_ID`		| -                |
+| `--otc-elastic-ip`		| `ELASTIC_IP`		| `1`                |
 
 Each environment variable may be overloaded by its option equivalent at runtime.
 
diff --git a/com/client/client.go b/com/client/client.go
index d19c1ff..eecf242 100644
--- a/com/client/client.go
+++ b/com/client/client.go
@@ -129,6 +129,7 @@ func InitV4Client(AK, SK, TenantID string, clientConfiguration modules.ClientCon
 	RequestParam.SK = SK
 	RequestParam.Token = ""
 	RequestParam.AuthType = modules.V4_AUTH
+	RequestParam.Subproject_ID = TenantID
 	client = &Client{TenantID, RequestParam}
 
 	return client
@@ -150,6 +151,7 @@ func InitTokenClient(Token, TenantID string, clientConfiguration modules.ClientC
 	RequestParam.ServiceName = clientConfiguration.ServiceName
 	RequestParam.Token = Token
 	RequestParam.AuthType = modules.Token_AUTH
+	RequestParam.Subproject_ID = TenantID
 	return &Client{TenantID, RequestParam}
 }
 
@@ -170,6 +172,7 @@ func GetToken(username, password, tenant_id string, clientConfiguration modules.
 	RequestParam.AuthType = modules.Token_AUTH
 	RequestParam.RequestContentType = modules.ApplicationJson
 	RequestParam.Token = ""
+	RequestParam.Subproject_ID = tenant_id
 
 	jsonStr := `{"auth": {"identity": {"methods": ["password"], "password": {"user": {"domain": {"name": ""}, "name": "", "password": ""}}}, "scope": {"domain": {"name": ""}, "project": {"id": ""}}}}`
 	var data AuthStructInfo
diff --git a/com/cpp_sdk_core/cpp_sdk_core.go b/com/cpp_sdk_core/cpp_sdk_core.go
index 19c9fe1..c4fc05c 100644
--- a/com/cpp_sdk_core/cpp_sdk_core.go
+++ b/com/cpp_sdk_core/cpp_sdk_core.go
@@ -206,6 +206,8 @@ func SendRequest(requestParam *modules.RequestParam) (result *modules.Result) {
 		var authString string
 		authString += modules.SDK_HMAC_SHA256 + " " + modules.CREDENTIAL + "=" + requestParam.AK + "/" + simpleTime + "/" + requestParam.Region + "/" + requestParam.ServiceName + "/" + modules.SDK_REQUEST + ", " + modules.SIGNED_HEADERS + "=" + signedHeadersValue + ", " + modules.SIGNATURE + "=" + finalSignature
 		headerCollection[strings.ToLower(modules.SDK_AUTHORIZATION_HEADER)] = strings.TrimSpace(authString)
+		//set special X-Project-Id header for subproject
+		headerCollection[modules.X_PROJECT_ID] = requestParam.Subproject_ID
 	}
 
 	conn := &http.Client{Transport: getTransport()}
diff --git a/com/modules/enum.go b/com/modules/enum.go
index 118ff52..4424206 100644
--- a/com/modules/enum.go
+++ b/com/modules/enum.go
@@ -78,4 +78,5 @@ const (
 	CREDENTIAL                  = "Credential"
 	SDK_AUTHORIZATION_HEADER    = "Authorization"
 	SDK_X_AUTH_TOKEN            = "X-Auth-Token"
+	X_PROJECT_ID                = "X-Project-Id"
 )
diff --git a/com/modules/modules.go b/com/modules/modules.go
index 24ddd41..670546b 100644
--- a/com/modules/modules.go
+++ b/com/modules/modules.go
@@ -58,6 +58,7 @@ type RequestParam struct {
 	RequestContentType string // Request content type
 	AuthType           int    // Authorization mode
 	Url                string // Http url
+	Subproject_ID      string // Subproject ID
 }
 
 /*