diff --git a/pkg/grpc/server.go b/pkg/grpc/server.go
index 886e310718..4dd1232430 100644
--- a/pkg/grpc/server.go
+++ b/pkg/grpc/server.go
@@ -155,13 +155,15 @@ func (s *Server) QueryKLines(ctx context.Context, request *pb.QueryKLinesRequest
 				response.Klines = append(response.Klines, &pb.KLine{
 					Exchange:    kline.Exchange.String(),
 					Symbol:      kline.Symbol,
+					Open:        kline.Open.String(),
+					High:        kline.High.String(),
+					Low:         kline.Low.String(),
+					Close:       kline.Close.String(),
+					Volume:      kline.Volume.String(),
+					QuoteVolume: kline.QuoteVolume.String(),
+					Closed:      kline.Closed,
 					StartTime:   kline.StartTime.UnixMilli(),
-					Open:        kline.Open.Float64(),
-					High:        kline.High.Float64(),
-					Low:         kline.Low.Float64(),
-					Close:       kline.Close.Float64(),
-					Volume:      kline.Volume.Float64(),
-					QuoteVolume: kline.QuoteVolume.Float64(),
+					EndTime:     kline.EndTime.UnixMilli(),
 				})
 			}
 
@@ -262,14 +264,15 @@ func transKLine(session *bbgo.ExchangeSession, kline types.KLine) *pb.SubscribeR
 			Session:     session.Name,
 			Exchange:    kline.Exchange.String(),
 			Symbol:      kline.Symbol,
-			Open:        kline.Open.Float64(),
-			High:        kline.High.Float64(),
-			Low:         kline.Low.Float64(),
-			Close:       kline.Close.Float64(),
-			Volume:      kline.Volume.Float64(),
-			QuoteVolume: kline.QuoteVolume.Float64(),
+			Open:        kline.Open.String(),
+			High:        kline.High.String(),
+			Low:         kline.Low.String(),
+			Close:       kline.Close.String(),
+			Volume:      kline.Volume.String(),
+			QuoteVolume: kline.QuoteVolume.String(),
 			StartTime:   kline.StartTime.UnixMilli(),
 			EndTime:     kline.StartTime.UnixMilli(),
+			Closed:      kline.Closed,
 		},
 		SubscribedAt: 0,
 	}
diff --git a/pkg/pb/bbgo.pb.go b/pkg/pb/bbgo.pb.go
index d771a2c462..f34c7fbaa1 100644
--- a/pkg/pb/bbgo.pb.go
+++ b/pkg/pb/bbgo.pb.go
@@ -2131,17 +2131,18 @@ type KLine struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	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"`
-	Open        float64 `protobuf:"fixed64,4,opt,name=open,proto3" json:"open,omitempty"`
-	High        float64 `protobuf:"fixed64,5,opt,name=high,proto3" json:"high,omitempty"`
-	Low         float64 `protobuf:"fixed64,6,opt,name=low,proto3" json:"low,omitempty"`
-	Close       float64 `protobuf:"fixed64,7,opt,name=close,proto3" json:"close,omitempty"`
-	Volume      float64 `protobuf:"fixed64,8,opt,name=volume,proto3" json:"volume,omitempty"`
-	QuoteVolume float64 `protobuf:"fixed64,9,opt,name=quote_volume,json=quoteVolume,proto3" json:"quote_volume,omitempty"`
-	StartTime   int64   `protobuf:"varint,10,opt,name=start_time,json=startTime,proto3" json:"start_time,omitempty"`
-	EndTime     int64   `protobuf:"varint,11,opt,name=end_time,json=endTime,proto3" json:"end_time,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"`
+	Open        string `protobuf:"bytes,4,opt,name=open,proto3" json:"open,omitempty"`
+	High        string `protobuf:"bytes,5,opt,name=high,proto3" json:"high,omitempty"`
+	Low         string `protobuf:"bytes,6,opt,name=low,proto3" json:"low,omitempty"`
+	Close       string `protobuf:"bytes,7,opt,name=close,proto3" json:"close,omitempty"`
+	Volume      string `protobuf:"bytes,8,opt,name=volume,proto3" json:"volume,omitempty"`
+	QuoteVolume string `protobuf:"bytes,9,opt,name=quote_volume,json=quoteVolume,proto3" json:"quote_volume,omitempty"`
+	StartTime   int64  `protobuf:"varint,10,opt,name=start_time,json=startTime,proto3" json:"start_time,omitempty"`
+	EndTime     int64  `protobuf:"varint,11,opt,name=end_time,json=endTime,proto3" json:"end_time,omitempty"`
+	Closed      bool   `protobuf:"varint,12,opt,name=closed,proto3" json:"closed,omitempty"`
 }
 
 func (x *KLine) Reset() {
@@ -2197,46 +2198,46 @@ func (x *KLine) GetSymbol() string {
 	return ""
 }
 
-func (x *KLine) GetOpen() float64 {
+func (x *KLine) GetOpen() string {
 	if x != nil {
 		return x.Open
 	}
-	return 0
+	return ""
 }
 
-func (x *KLine) GetHigh() float64 {
+func (x *KLine) GetHigh() string {
 	if x != nil {
 		return x.High
 	}
-	return 0
+	return ""
 }
 
-func (x *KLine) GetLow() float64 {
+func (x *KLine) GetLow() string {
 	if x != nil {
 		return x.Low
 	}
-	return 0
+	return ""
 }
 
-func (x *KLine) GetClose() float64 {
+func (x *KLine) GetClose() string {
 	if x != nil {
 		return x.Close
 	}
-	return 0
+	return ""
 }
 
-func (x *KLine) GetVolume() float64 {
+func (x *KLine) GetVolume() string {
 	if x != nil {
 		return x.Volume
 	}
-	return 0
+	return ""
 }
 
-func (x *KLine) GetQuoteVolume() float64 {
+func (x *KLine) GetQuoteVolume() string {
 	if x != nil {
 		return x.QuoteVolume
 	}
-	return 0
+	return ""
 }
 
 func (x *KLine) GetStartTime() int64 {
@@ -2253,6 +2254,13 @@ func (x *KLine) GetEndTime() int64 {
 	return 0
 }
 
+func (x *KLine) GetClosed() bool {
+	if x != nil {
+		return x.Closed
+	}
+	return false
+}
+
 var File_pkg_pb_bbgo_proto protoreflect.FileDescriptor
 
 var file_pkg_pb_bbgo_proto_rawDesc = []byte{
@@ -2498,90 +2506,92 @@ var file_pkg_pb_bbgo_proto_rawDesc = []byte{
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 }
 
 var (
diff --git a/pkg/pb/bbgo.proto b/pkg/pb/bbgo.proto
index 3545c76ad6..1858c4726f 100644
--- a/pkg/pb/bbgo.proto
+++ b/pkg/pb/bbgo.proto
@@ -258,12 +258,13 @@ message KLine {
   string session = 1;
   string exchange = 2;
   string symbol = 3;
-  double open = 4;
-  double high = 5;
-  double low = 6;
-  double close = 7;
-  double volume = 8;
-  double quote_volume = 9;
+  string open = 4;
+  string high = 5;
+  string low = 6;
+  string close = 7;
+  string volume = 8;
+  string quote_volume = 9;
   int64 start_time = 10;
   int64 end_time = 11;
+  bool closed = 12;
 }