diff --git a/pkg/grpc/convert.go b/pkg/grpc/convert.go
index 6dc3225df..cce9e77cc 100644
--- a/pkg/grpc/convert.go
+++ b/pkg/grpc/convert.go
@@ -4,7 +4,10 @@ import (
 	"fmt"
 	"strconv"
 
+	log "github.com/sirupsen/logrus"
+
 	"github.com/c9s/bbgo/pkg/bbgo"
+	"github.com/c9s/bbgo/pkg/fixedpoint"
 	"github.com/c9s/bbgo/pkg/pb"
 	"github.com/c9s/bbgo/pkg/types"
 )
@@ -65,6 +68,49 @@ func transBook(session *bbgo.ExchangeSession, book types.SliceOrderBook, event p
 	}
 }
 
+func toOrderType(orderType pb.OrderType) types.OrderType {
+	switch orderType {
+	case pb.OrderType_MARKET:
+		return types.OrderTypeMarket
+	case pb.OrderType_LIMIT:
+		return types.OrderTypeLimit
+
+	}
+
+	log.Warnf("unexpected order type: %v", orderType)
+	return types.OrderTypeLimit
+}
+
+func toSide(side pb.Side) types.SideType {
+	switch side {
+	case pb.Side_BUY:
+		return types.SideTypeBuy
+	case pb.Side_SELL:
+		return types.SideTypeSell
+
+	}
+
+	log.Warnf("unexpected side type: %v", side)
+	return types.SideTypeBuy
+}
+
+func toSubmitOrders(pbOrders []*pb.SubmitOrder) (submitOrders []types.SubmitOrder) {
+	for _, pbOrder := range pbOrders {
+		submitOrders = append(submitOrders, types.SubmitOrder{
+			ClientOrderID:    pbOrder.ClientOrderId,
+			Symbol:           pbOrder.Symbol,
+			Side:             toSide(pbOrder.Side),
+			Type:             toOrderType(pbOrder.OrderType),
+			Price:            fixedpoint.MustNewFromString(pbOrder.Price),
+			Quantity:         fixedpoint.MustNewFromString(pbOrder.Quantity),
+			StopPrice:        fixedpoint.MustNewFromString(pbOrder.StopPrice),
+			TimeInForce:      "",
+		})
+	}
+
+	return submitOrders
+}
+
 func transBalances(session *bbgo.ExchangeSession, balances types.BalanceMap) (pbBalances []*pb.Balance) {
 	for _, b := range balances {
 		pbBalances = append(pbBalances, &pb.Balance{
diff --git a/pkg/grpc/server.go b/pkg/grpc/server.go
index c3c370ee7..131991ac4 100644
--- a/pkg/grpc/server.go
+++ b/pkg/grpc/server.go
@@ -16,6 +16,60 @@ import (
 	"github.com/c9s/bbgo/pkg/types"
 )
 
+type TradingService struct {
+	Config  *bbgo.Config
+	Environ *bbgo.Environment
+	Trader  *bbgo.Trader
+
+	pb.UnimplementedTradingServiceServer
+}
+
+func (s *TradingService) SubmitOrder(ctx context.Context, request *pb.SubmitOrderRequest) (*pb.SubmitOrderResponse, error) {
+	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)
+	}
+
+	submitOrders := toSubmitOrders(request.SubmitOrders)
+	for i := range submitOrders {
+		if market, ok := session.Market(submitOrders[i].Symbol); ok {
+			submitOrders[i].Market = market
+		} else {
+			log.Warnf("session %s market %s not found", sessionName, submitOrders[i].Symbol)
+		}
+	}
+
+	createdOrders, err := session.Exchange.SubmitOrders(ctx, submitOrders...)
+	if err != nil {
+		return nil, err
+	}
+	_ = createdOrders
+
+	return nil, nil
+}
+
+func (s *TradingService) CancelOrder(ctx context.Context, request *pb.CancelOrderRequest) (*pb.CancelOrderResponse, error) {
+	panic("implement me")
+}
+
+func (s *TradingService) QueryOrder(ctx context.Context, request *pb.QueryOrderRequest) (*pb.QueryOrderResponse, error) {
+	panic("implement me")
+}
+
+func (s *TradingService) QueryOrders(ctx context.Context, request *pb.QueryOrdersRequest) (*pb.QueryOrdersResponse, error) {
+	panic("implement me")
+}
+
+func (s *TradingService) QueryTrades(ctx context.Context, request *pb.QueryTradesRequest) (*pb.QueryTradesResponse, error) {
+	panic("implement me")
+}
+
 type UserDataService struct {
 	Config  *bbgo.Config
 	Environ *bbgo.Environment
diff --git a/pkg/pb/bbgo.pb.go b/pkg/pb/bbgo.pb.go
index a49300b42..cd5378a6b 100644
--- a/pkg/pb/bbgo.pb.go
+++ b/pkg/pb/bbgo.pb.go
@@ -1231,15 +1231,16 @@ type SubmitOrder struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Exchange      string    `protobuf:"bytes,1,opt,name=exchange,proto3" json:"exchange,omitempty"`
-	Symbol        string    `protobuf:"bytes,2,opt,name=symbol,proto3" json:"symbol,omitempty"`
-	Side          Side      `protobuf:"varint,3,opt,name=side,proto3,enum=bbgo.Side" json:"side,omitempty"`
-	Quantity      float64   `protobuf:"fixed64,4,opt,name=quantity,proto3" json:"quantity,omitempty"`
-	Price         float64   `protobuf:"fixed64,5,opt,name=price,proto3" json:"price,omitempty"`
-	StopPrice     float64   `protobuf:"fixed64,6,opt,name=stop_price,json=stopPrice,proto3" json:"stop_price,omitempty"`
-	OrderType     OrderType `protobuf:"varint,7,opt,name=order_type,json=orderType,proto3,enum=bbgo.OrderType" json:"order_type,omitempty"`
-	ClientOrderId string    `protobuf:"bytes,8,opt,name=client_order_id,json=clientOrderId,proto3" json:"client_order_id,omitempty"`
-	GroupId       int64     `protobuf:"varint,9,opt,name=group_id,json=groupId,proto3" json:"group_id,omitempty"`
+	Session       string    `protobuf:"bytes,1,opt,name=session,proto3" json:"session,omitempty"`
+	Exchange      string    `protobuf:"bytes,2,opt,name=exchange,proto3" json:"exchange,omitempty"`
+	Symbol        string    `protobuf:"bytes,3,opt,name=symbol,proto3" json:"symbol,omitempty"`
+	Side          Side      `protobuf:"varint,4,opt,name=side,proto3,enum=bbgo.Side" json:"side,omitempty"`
+	Quantity      float64   `protobuf:"fixed64,5,opt,name=quantity,proto3" json:"quantity,omitempty"`
+	Price         float64   `protobuf:"fixed64,6,opt,name=price,proto3" json:"price,omitempty"`
+	StopPrice     float64   `protobuf:"fixed64,7,opt,name=stop_price,json=stopPrice,proto3" json:"stop_price,omitempty"`
+	OrderType     OrderType `protobuf:"varint,8,opt,name=order_type,json=orderType,proto3,enum=bbgo.OrderType" json:"order_type,omitempty"`
+	ClientOrderId string    `protobuf:"bytes,9,opt,name=client_order_id,json=clientOrderId,proto3" json:"client_order_id,omitempty"`
+	GroupId       int64     `protobuf:"varint,10,opt,name=group_id,json=groupId,proto3" json:"group_id,omitempty"`
 }
 
 func (x *SubmitOrder) Reset() {
@@ -1274,6 +1275,13 @@ func (*SubmitOrder) Descriptor() ([]byte, []int) {
 	return file_pkg_pb_bbgo_proto_rawDescGZIP(), []int{12}
 }
 
+func (x *SubmitOrder) GetSession() string {
+	if x != nil {
+		return x.Session
+	}
+	return ""
+}
+
 func (x *SubmitOrder) GetExchange() string {
 	if x != nil {
 		return x.Exchange
@@ -1343,11 +1351,12 @@ type Balance struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Exchange  string `protobuf:"bytes,1,opt,name=exchange,proto3" json:"exchange,omitempty"`
-	Currency  string `protobuf:"bytes,2,opt,name=currency,proto3" json:"currency,omitempty"`
-	Available string `protobuf:"bytes,3,opt,name=available,proto3" json:"available,omitempty"`
-	Locked    string `protobuf:"bytes,4,opt,name=locked,proto3" json:"locked,omitempty"`
-	Borrowed  string `protobuf:"bytes,5,opt,name=borrowed,proto3" json:"borrowed,omitempty"`
+	Session   string `protobuf:"bytes,1,opt,name=session,proto3" json:"session,omitempty"`
+	Exchange  string `protobuf:"bytes,2,opt,name=exchange,proto3" json:"exchange,omitempty"`
+	Currency  string `protobuf:"bytes,3,opt,name=currency,proto3" json:"currency,omitempty"`
+	Available string `protobuf:"bytes,4,opt,name=available,proto3" json:"available,omitempty"`
+	Locked    string `protobuf:"bytes,5,opt,name=locked,proto3" json:"locked,omitempty"`
+	Borrowed  string `protobuf:"bytes,6,opt,name=borrowed,proto3" json:"borrowed,omitempty"`
 }
 
 func (x *Balance) Reset() {
@@ -1382,6 +1391,13 @@ func (*Balance) Descriptor() ([]byte, []int) {
 	return file_pkg_pb_bbgo_proto_rawDescGZIP(), []int{13}
 }
 
+func (x *Balance) GetSession() string {
+	if x != nil {
+		return x.Session
+	}
+	return ""
+}
+
 func (x *Balance) GetExchange() string {
 	if x != nil {
 		return x.Exchange
@@ -1422,7 +1438,8 @@ type SubmitOrderRequest struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	SubmitOrder *SubmitOrder `protobuf:"bytes,1,opt,name=submit_order,json=submitOrder,proto3" json:"submit_order,omitempty"`
+	Session      string         `protobuf:"bytes,1,opt,name=session,proto3" json:"session,omitempty"`
+	SubmitOrders []*SubmitOrder `protobuf:"bytes,2,rep,name=submit_orders,json=submitOrders,proto3" json:"submit_orders,omitempty"`
 }
 
 func (x *SubmitOrderRequest) Reset() {
@@ -1457,9 +1474,16 @@ func (*SubmitOrderRequest) Descriptor() ([]byte, []int) {
 	return file_pkg_pb_bbgo_proto_rawDescGZIP(), []int{14}
 }
 
-func (x *SubmitOrderRequest) GetSubmitOrder() *SubmitOrder {
+func (x *SubmitOrderRequest) GetSession() string {
 	if x != nil {
-		return x.SubmitOrder
+		return x.Session
+	}
+	return ""
+}
+
+func (x *SubmitOrderRequest) GetSubmitOrders() []*SubmitOrder {
+	if x != nil {
+		return x.SubmitOrders
 	}
 	return nil
 }
@@ -1524,7 +1548,7 @@ type CancelOrderRequest struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Exchange      string `protobuf:"bytes,1,opt,name=exchange,proto3" json:"exchange,omitempty"`
+	Session       string `protobuf:"bytes,1,opt,name=session,proto3" json:"session,omitempty"`
 	Id            string `protobuf:"bytes,2,opt,name=id,proto3" json:"id,omitempty"`
 	ClientOrderId string `protobuf:"bytes,3,opt,name=client_order_id,json=clientOrderId,proto3" json:"client_order_id,omitempty"`
 }
@@ -1561,9 +1585,9 @@ func (*CancelOrderRequest) Descriptor() ([]byte, []int) {
 	return file_pkg_pb_bbgo_proto_rawDescGZIP(), []int{16}
 }
 
-func (x *CancelOrderRequest) GetExchange() string {
+func (x *CancelOrderRequest) GetSession() string {
 	if x != nil {
-		return x.Exchange
+		return x.Session
 	}
 	return ""
 }
@@ -1642,7 +1666,7 @@ type QueryOrderRequest struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Exchange      string `protobuf:"bytes,1,opt,name=exchange,proto3" json:"exchange,omitempty"`
+	Session       string `protobuf:"bytes,1,opt,name=session,proto3" json:"session,omitempty"`
 	Id            string `protobuf:"bytes,2,opt,name=id,proto3" json:"id,omitempty"`
 	ClientOrderId string `protobuf:"bytes,3,opt,name=client_order_id,json=clientOrderId,proto3" json:"client_order_id,omitempty"`
 }
@@ -1679,9 +1703,9 @@ func (*QueryOrderRequest) Descriptor() ([]byte, []int) {
 	return file_pkg_pb_bbgo_proto_rawDescGZIP(), []int{18}
 }
 
-func (x *QueryOrderRequest) GetExchange() string {
+func (x *QueryOrderRequest) GetSession() string {
 	if x != nil {
-		return x.Exchange
+		return x.Session
 	}
 	return ""
 }
@@ -1760,7 +1784,7 @@ type QueryOrdersRequest struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Exchange   string   `protobuf:"bytes,1,opt,name=exchange,proto3" json:"exchange,omitempty"`
+	Session    string   `protobuf:"bytes,1,opt,name=session,proto3" json:"session,omitempty"`
 	Symbol     string   `protobuf:"bytes,2,opt,name=symbol,proto3" json:"symbol,omitempty"`
 	State      []string `protobuf:"bytes,3,rep,name=state,proto3" json:"state,omitempty"`
 	OrderBy    string   `protobuf:"bytes,4,opt,name=order_by,json=orderBy,proto3" json:"order_by,omitempty"`
@@ -1803,9 +1827,9 @@ func (*QueryOrdersRequest) Descriptor() ([]byte, []int) {
 	return file_pkg_pb_bbgo_proto_rawDescGZIP(), []int{20}
 }
 
-func (x *QueryOrdersRequest) GetExchange() string {
+func (x *QueryOrdersRequest) GetSession() string {
 	if x != nil {
-		return x.Exchange
+		return x.Session
 	}
 	return ""
 }
@@ -2506,209 +2530,214 @@ var file_pkg_pb_bbgo_proto_rawDesc = []byte{
 	0x12, 0x19, 0x0a, 0x08, 0x67, 0x72, 0x6f, 0x75, 0x70, 0x5f, 0x69, 0x64, 0x18, 0x0f, 0x20, 0x01,
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+	0x33,
 }
 
 var (
@@ -2780,7 +2809,7 @@ var file_pkg_pb_bbgo_proto_depIdxs = []int32{
 	3,  // 18: bbgo.Order.order_type:type_name -> bbgo.OrderType
 	2,  // 19: bbgo.SubmitOrder.side:type_name -> bbgo.Side
 	3,  // 20: bbgo.SubmitOrder.order_type:type_name -> bbgo.OrderType
-	16, // 21: bbgo.SubmitOrderRequest.submit_order:type_name -> bbgo.SubmitOrder
+	16, // 21: bbgo.SubmitOrderRequest.submit_orders:type_name -> bbgo.SubmitOrder
 	15, // 22: bbgo.SubmitOrderResponse.order:type_name -> bbgo.Order
 	5,  // 23: bbgo.SubmitOrderResponse.error:type_name -> bbgo.Error
 	15, // 24: bbgo.CancelOrderResponse.order:type_name -> bbgo.Order
diff --git a/pkg/pb/bbgo.proto b/pkg/pb/bbgo.proto
index cc67c57af..24259ec40 100644
--- a/pkg/pb/bbgo.proto
+++ b/pkg/pb/bbgo.proto
@@ -160,37 +160,41 @@ message Order {
 }
 
 message SubmitOrder {
-  string exchange = 1;
-  string symbol = 2;
-  Side side = 3;
-  double quantity = 4;
-  double price = 5;
-  double stop_price = 6;
-  OrderType order_type = 7;
-  string client_order_id = 8;
-  int64 group_id = 9;
+  string session = 1;
+  string exchange = 2;
+  string symbol = 3;
+  Side side = 4;
+  double quantity = 5;
+  double price = 6;
+  double stop_price = 7;
+  OrderType order_type = 8;
+  string client_order_id = 9;
+  int64 group_id = 10;
 }
 
 // https://maicoin.github.io/max-websocket-docs/#/private_channels?id=account-response
 message Balance {
-  string exchange = 1;
-  string currency = 2;
-  string available = 3;
-  string locked = 4;
-  string borrowed = 5;
+  string session = 1;
+  string exchange = 2;
+  string currency = 3;
+  string available = 4;
+  string locked = 5;
+  string borrowed = 6;
 }
 
 message SubmitOrderRequest {
-  SubmitOrder submit_order = 1;
+  string session = 1;
+  repeated SubmitOrder submit_orders = 2;
 }
 
 message SubmitOrderResponse {
-  Order order = 1;
-  Error error = 2;
+  string session = 1;
+  repeated Order orders = 2;
+  Error error = 3;
 }
 
 message CancelOrderRequest {
-  string exchange = 1;
+  string session = 1;
   string id = 2;
   string client_order_id = 3;
 }
@@ -201,7 +205,7 @@ message CancelOrderResponse {
 }
 
 message QueryOrderRequest {
-  string exchange = 1;
+  string session = 1;
   string id = 2;
   string client_order_id = 3;
 }
@@ -212,7 +216,7 @@ message QueryOrderResponse {
 }
 
 message QueryOrdersRequest {
-  string exchange = 1;
+  string session = 1;
   string symbol = 2;
   repeated string state = 3;
   string order_by = 4;