diff --git a/pkg/grpc/server.go b/pkg/grpc/server.go
index 3761b01df..fd9632aa7 100644
--- a/pkg/grpc/server.go
+++ b/pkg/grpc/server.go
@@ -4,6 +4,7 @@ import (
 	"context"
 	"fmt"
 	"net"
+	"strconv"
 	"time"
 
 	"github.com/pkg/errors"
@@ -62,7 +63,34 @@ func (s *TradingService) SubmitOrder(ctx context.Context, request *pb.SubmitOrde
 }
 
 func (s *TradingService) CancelOrder(ctx context.Context, request *pb.CancelOrderRequest) (*pb.CancelOrderResponse, error) {
-	panic("implement me")
+	sessionName := request.Session
+
+	if len(sessionName) == 0 {
+		return nil, fmt.Errorf("session name can not be empty")
+	}
+
+	session, ok := s.Environ.Session(sessionName)
+	if !ok {
+		return nil, fmt.Errorf("session %s not found", sessionName)
+	}
+
+	uuidOrderID := ""
+	orderID, err := strconv.ParseUint(request.OrderId, 10, 64)
+	if err != nil {
+		// TODO: validate uuid
+		uuidOrderID = request.OrderId
+	}
+
+	session.Exchange.CancelOrders(ctx, types.Order{
+		SubmitOrder: types.SubmitOrder{
+			ClientOrderID: request.ClientOrderId,
+		},
+		OrderID: orderID,
+		UUID:    uuidOrderID,
+	})
+
+	resp := &pb.CancelOrderResponse{}
+	return resp, nil
 }
 
 func (s *TradingService) QueryOrder(ctx context.Context, request *pb.QueryOrderRequest) (*pb.QueryOrderResponse, error) {
diff --git a/pkg/pb/bbgo.pb.go b/pkg/pb/bbgo.pb.go
index 7a7223250..cb3cf0e10 100644
--- a/pkg/pb/bbgo.pb.go
+++ b/pkg/pb/bbgo.pb.go
@@ -1557,7 +1557,7 @@ type CancelOrderRequest struct {
 	unknownFields protoimpl.UnknownFields
 
 	Session       string `protobuf:"bytes,1,opt,name=session,proto3" json:"session,omitempty"`
-	Id            string `protobuf:"bytes,2,opt,name=id,proto3" json:"id,omitempty"`
+	OrderId       string `protobuf:"bytes,2,opt,name=order_id,json=orderId,proto3" json:"order_id,omitempty"`
 	ClientOrderId string `protobuf:"bytes,3,opt,name=client_order_id,json=clientOrderId,proto3" json:"client_order_id,omitempty"`
 }
 
@@ -1600,9 +1600,9 @@ func (x *CancelOrderRequest) GetSession() string {
 	return ""
 }
 
-func (x *CancelOrderRequest) GetId() string {
+func (x *CancelOrderRequest) GetOrderId() string {
 	if x != nil {
-		return x.Id
+		return x.OrderId
 	}
 	return ""
 }
@@ -2583,170 +2583,171 @@ var file_pkg_pb_bbgo_proto_rawDesc = []byte{
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+	0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
diff --git a/pkg/pb/bbgo.proto b/pkg/pb/bbgo.proto
index 45eaf7793..bbe1ab5e2 100644
--- a/pkg/pb/bbgo.proto
+++ b/pkg/pb/bbgo.proto
@@ -195,7 +195,7 @@ message SubmitOrderResponse {
 
 message CancelOrderRequest {
   string session = 1;
-  string id = 2;
+  string order_id = 2;
   string client_order_id = 3;
 }