diff --git a/.vscode/settings.json b/.vscode/settings.json
new file mode 100644
index 00000000..328ef5ee
--- /dev/null
+++ b/.vscode/settings.json
@@ -0,0 +1,5 @@
+{
+    "cSpell.words": [
+        "ocos"
+    ]
+}
\ No newline at end of file
diff --git a/v2/client.go b/v2/client.go
index 8754985e..2bc6e0ed 100644
--- a/v2/client.go
+++ b/v2/client.go
@@ -421,6 +421,11 @@ func (c *Client) NewListOpenOrdersService() *ListOpenOrdersService {
 	return &ListOpenOrdersService{c: c}
 }
 
+// NewListOpenOcoService init list open oco service
+func (c *Client) NewListOpenOcoService() *ListOpenOcoService {
+	return &ListOpenOcoService{c: c}
+}
+
 // NewListOrdersService init listing orders service
 func (c *Client) NewListOrdersService() *ListOrdersService {
 	return &ListOrdersService{c: c}
diff --git a/v2/margin_order_service_test.go b/v2/margin_order_service_test.go
index dc04f9e5..38d97a17 100644
--- a/v2/margin_order_service_test.go
+++ b/v2/margin_order_service_test.go
@@ -143,7 +143,7 @@ func (s *marginOrderServiceTestSuite) TestCreateOrderFull() {
 		Type:                     OrderTypeLimit,
 		Side:                     SideTypeBuy,
 		Fills: []*Fill{
-			&Fill{
+			{
 				Price:           "0.00002991",
 				Quantity:        "344.00000000",
 				Commission:      "0.00332384",
diff --git a/v2/order_service.go b/v2/order_service.go
index 56fc9592..18887609 100644
--- a/v2/order_service.go
+++ b/v2/order_service.go
@@ -378,6 +378,42 @@ type OCOOrderReport struct {
 	IcebergQuantity          string          `json:"icebergQty"`
 }
 
+// ListOpenOcoService list opened oco
+type ListOpenOcoService struct {
+	c *Client
+}
+
+// oco define oco info
+type Oco struct {
+	Symbol            string   `json:"symbol"`
+	OrderListId       int64    `json:"orderListId"`
+	ContingencyType   string   `json:"contingencyType"`
+	ListStatusType    string   `json:"listStatusType"`
+	ListOrderStatus   string   `json:"listOrderStatus"`
+	ListClientOrderID string   `json:"listClientOrderId"`
+	TransactionTime   int64    `json:"transactionTime"`
+	Orders            []*Order `json:"orders"`
+}
+
+// Do send request
+func (s *ListOpenOcoService) Do(ctx context.Context, opts ...RequestOption) (res []*Oco, err error) {
+	r := &request{
+		method:   http.MethodGet,
+		endpoint: "/api/v3/openOrderList ",
+		secType:  secTypeSigned,
+	}
+	data, err := s.c.callAPI(ctx, r, opts...)
+	if err != nil {
+		return []*Oco{}, err
+	}
+	res = make([]*Oco, 0)
+	err = json.Unmarshal(data, &res)
+	if err != nil {
+		return []*Oco{}, err
+	}
+	return res, nil
+}
+
 // ListOpenOrdersService list opened orders
 type ListOpenOrdersService struct {
 	c      *Client
diff --git a/v2/order_service_test.go b/v2/order_service_test.go
index 0fd8cf46..5508485e 100644
--- a/v2/order_service_test.go
+++ b/v2/order_service_test.go
@@ -150,7 +150,7 @@ func (s *orderServiceTestSuite) TestCreateOrderFull() {
 		Type:                     OrderTypeLimit,
 		Side:                     SideTypeBuy,
 		Fills: []*Fill{
-			&Fill{
+			{
 				Price:           "0.00002991",
 				Quantity:        "344.00000000",
 				Commission:      "0.00332384",
@@ -387,7 +387,83 @@ func (s *baseOrderTestSuite) assertOCOOrderEqual(e, a *OCOOrder) {
 	r.Equal(e.OrderID, a.OrderID, "OrderID")
 	r.Equal(e.Symbol, a.Symbol, "Symbol")
 }
-
+func (s *orderServiceTestSuite) TestListOpenOco() {
+	data := []byte(`[
+		{
+			"orderListId": 31,
+			"contingencyType": "OCO",
+			"listStatusType": "EXEC_STARTED",
+			"listOrderStatus": "EXECUTING",
+			"listClientOrderId": "wuB13fmulKj3YjdqWEcsnp",
+			"transactionTime": 1565246080644,
+			"symbol": "LTCBTC",
+			"orders": [
+			  {
+				"symbol": "LTCBTC",
+				"orderId": 4,
+				"clientOrderId": "r3EH2N76dHfLoSZWIUw1bT"
+			  },
+			  {
+				"symbol": "LTCBTC",
+				"orderId": 5,
+				"clientOrderId": "Cv1SnyPD3qhqpbjpYEHbd2"
+			  }
+			]
+		  }
+    ]`)
+	s.mockDo(data, nil)
+	defer s.assertDo()
+	recvWindow := int64(1000)
+	s.assertReq(func(r *request) {
+		e := newSignedRequest().setParams(params{
+			"recvWindow": recvWindow,
+		})
+		s.assertRequestEqual(e, r)
+	})
+	ocos, err := s.client.NewListOpenOcoService().
+		Do(newContext(), WithRecvWindow(recvWindow))
+	r := s.r()
+	r.NoError(err)
+	r.Len(ocos, 1)
+	e := &Oco{
+		Symbol:            "LTCBTC",
+		OrderListId:       31,
+		ContingencyType:   "OCO",
+		ListStatusType:    "EXEC_STARTED",
+		ListOrderStatus:   "EXECUTING",
+		ListClientOrderID: "wuB13fmulKj3YjdqWEcsnp",
+		TransactionTime:   1565246080644,
+		Orders: []*Order{
+			{
+				Symbol:        "LTCBTC",
+				OrderID:       4,
+				ClientOrderID: "r3EH2N76dHfLoSZWIUw1bT",
+			},
+			{
+				Symbol:        "LTCBTC",
+				OrderID:       5,
+				ClientOrderID: "Cv1SnyPD3qhqpbjpYEHbd2",
+			},
+		},
+	}
+	s.assertOcoEqual(e, ocos[0])
+}
+func (s *baseOrderTestSuite) assertOcoEqual(e, a *Oco) {
+	r := s.r()
+	r.Equal(e.Symbol, a.Symbol, "Symbol")
+	r.Equal(e.ContingencyType, a.ContingencyType, "ContingencyType")
+	r.Equal(e.ListClientOrderID, a.ListClientOrderID, "ListClientOrderID")
+	r.Equal(e.ListOrderStatus, a.ListOrderStatus, "ListOrderStatus")
+	r.Equal(e.ListStatusType, a.ListStatusType, "ListStatusType")
+	r.Equal(e.OrderListId, a.OrderListId, "OrderListId")
+	r.Equal(e.Orders[0].Symbol, a.Orders[0].Symbol, "Orders[0].Symbol")
+	r.Equal(e.Orders[0].OrderID, a.Orders[0].OrderID, "Orders[0].OrderID")
+	r.Equal(e.Orders[0].ClientOrderID, a.Orders[0].ClientOrderID, "Orders[0].ClientOrderID")
+	r.Equal(e.Orders[1].Symbol, a.Orders[1].Symbol, "Orders[1].Symbol")
+	r.Equal(e.Orders[1].OrderID, a.Orders[1].OrderID, "Orders[1].OrderID")
+	r.Equal(e.Orders[1].ClientOrderID, a.Orders[1].ClientOrderID, "Orders[1].ClientOrderID")
+	r.Equal(e.TransactionTime, a.TransactionTime, "TransactionTime")
+}
 func (s *orderServiceTestSuite) TestListOpenOrders() {
 	data := []byte(`[
         {