diff --git a/debug/service/handler/debug.go b/debug/service/handler/debug.go
index 967a3218..ffe1a922 100644
--- a/debug/service/handler/debug.go
+++ b/debug/service/handler/debug.go
@@ -66,15 +66,23 @@ func (d *Debug) Trace(ctx context.Context, req *proto.TraceRequest, rsp *proto.T
 		return err
 	}
 
-	for _, trace := range traces {
+	for _, t := range traces {
+		var typ proto.SpanType
+		switch t.Type {
+		case trace.SpanTypeRequestInbound:
+			typ = proto.SpanType_INBOUND
+		case trace.SpanTypeRequestOutbound:
+			typ = proto.SpanType_OUTBOUND
+		}
 		rsp.Spans = append(rsp.Spans, &proto.Span{
-			Trace:    trace.Trace,
-			Id:       trace.Id,
-			Parent:   trace.Parent,
-			Name:     trace.Name,
-			Started:  uint64(trace.Started.UnixNano()),
-			Duration: uint64(trace.Duration.Nanoseconds()),
-			Metadata: trace.Metadata,
+			Trace:    t.Trace,
+			Id:       t.Id,
+			Parent:   t.Parent,
+			Name:     t.Name,
+			Started:  uint64(t.Started.UnixNano()),
+			Duration: uint64(t.Duration.Nanoseconds()),
+			Type:     typ,
+			Metadata: t.Metadata,
 		})
 	}
 
diff --git a/debug/service/proto/debug.pb.go b/debug/service/proto/debug.pb.go
index a2378b30..83e43aaa 100644
--- a/debug/service/proto/debug.pb.go
+++ b/debug/service/proto/debug.pb.go
@@ -20,6 +20,31 @@ var _ = math.Inf
 // proto package needs to be updated.
 const _ = proto.ProtoPackageIsVersion3 // please upgrade the proto package
 
+type SpanType int32
+
+const (
+	SpanType_INBOUND  SpanType = 0
+	SpanType_OUTBOUND SpanType = 1
+)
+
+var SpanType_name = map[int32]string{
+	0: "INBOUND",
+	1: "OUTBOUND",
+}
+
+var SpanType_value = map[string]int32{
+	"INBOUND":  0,
+	"OUTBOUND": 1,
+}
+
+func (x SpanType) String() string {
+	return proto.EnumName(SpanType_name, int32(x))
+}
+
+func (SpanType) EnumDescriptor() ([]byte, []int) {
+	return fileDescriptor_dea322649cde1ef2, []int{0}
+}
+
 type HealthRequest struct {
 	// optional service name
 	Service              string   `protobuf:"bytes,1,opt,name=service,proto3" json:"service,omitempty"`
@@ -466,6 +491,7 @@ type Span struct {
 	Duration uint64 `protobuf:"varint,6,opt,name=duration,proto3" json:"duration,omitempty"`
 	// associated metadata
 	Metadata             map[string]string `protobuf:"bytes,7,rep,name=metadata,proto3" json:"metadata,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
+	Type                 SpanType          `protobuf:"varint,8,opt,name=type,proto3,enum=SpanType" json:"type,omitempty"`
 	XXX_NoUnkeyedLiteral struct{}          `json:"-"`
 	XXX_unrecognized     []byte            `json:"-"`
 	XXX_sizecache        int32             `json:"-"`
@@ -545,7 +571,15 @@ func (m *Span) GetMetadata() map[string]string {
 	return nil
 }
 
+func (m *Span) GetType() SpanType {
+	if m != nil {
+		return m.Type
+	}
+	return SpanType_INBOUND
+}
+
 func init() {
+	proto.RegisterEnum("SpanType", SpanType_name, SpanType_value)
 	proto.RegisterType((*HealthRequest)(nil), "HealthRequest")
 	proto.RegisterType((*HealthResponse)(nil), "HealthResponse")
 	proto.RegisterType((*StatsRequest)(nil), "StatsRequest")
@@ -564,40 +598,43 @@ func init() {
 }
 
 var fileDescriptor_dea322649cde1ef2 = []byte{
-	// 553 bytes of a gzipped FileDescriptorProto
-	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0xa4, 0x54, 0xcd, 0x6e, 0xd4, 0x30,
-	0x10, 0xde, 0x24, 0x9b, 0xdd, 0xcd, 0xb4, 0x09, 0xc8, 0xfc, 0x28, 0x0a, 0x08, 0x2a, 0x9f, 0x16,
-	0x01, 0x5e, 0x28, 0x17, 0x04, 0x57, 0x90, 0x38, 0x94, 0x8b, 0xcb, 0x0b, 0xb8, 0x89, 0x95, 0x06,
-	0x9a, 0x38, 0xd8, 0x4e, 0xa5, 0x7d, 0x24, 0x6e, 0xbc, 0x0c, 0x6f, 0xc3, 0x01, 0xf9, 0x27, 0xdb,
-	0x44, 0x08, 0xf5, 0xc0, 0xcd, 0xdf, 0xe7, 0xf1, 0x97, 0x99, 0x6f, 0x66, 0x02, 0xa4, 0x6d, 0x4a,
-	0x29, 0x76, 0xb5, 0x78, 0xe9, 0x0e, 0x15, 0xbf, 0x18, 0xea, 0x9d, 0xe2, 0xf2, 0xba, 0x29, 0xf9,
-	0xae, 0x97, 0x42, 0x7b, 0x8e, 0xd8, 0x33, 0x7e, 0x06, 0xe9, 0x27, 0xce, 0xae, 0xf4, 0x25, 0xe5,
-	0xdf, 0x07, 0xae, 0x34, 0xca, 0x61, 0xed, 0xa3, 0xf3, 0xe0, 0x24, 0xd8, 0x26, 0x74, 0x84, 0x78,
-	0x0b, 0xd9, 0x18, 0xaa, 0x7a, 0xd1, 0x29, 0x8e, 0x1e, 0xc2, 0x4a, 0x69, 0xa6, 0x07, 0xe5, 0x43,
-	0x3d, 0xc2, 0x5b, 0x38, 0x3e, 0xd7, 0x4c, 0xab, 0xdb, 0x35, 0x7f, 0x05, 0x90, 0xfa, 0x50, 0xaf,
-	0xf9, 0x18, 0x12, 0xdd, 0xb4, 0x5c, 0x69, 0xd6, 0xf6, 0x36, 0x7a, 0x49, 0x6f, 0x08, 0xab, 0xa4,
-	0x99, 0xd4, 0xbc, 0xca, 0x43, 0x7b, 0x37, 0x42, 0x93, 0xcb, 0xd0, 0x9b, 0xc0, 0x3c, 0xb2, 0x17,
-	0x1e, 0x19, 0xbe, 0xe5, 0xad, 0x90, 0xfb, 0x7c, 0xe9, 0x78, 0x87, 0x8c, 0x92, 0xbe, 0x94, 0x9c,
-	0x55, 0x2a, 0x8f, 0x9d, 0x92, 0x87, 0x28, 0x83, 0xb0, 0x2e, 0xf3, 0x95, 0x25, 0xc3, 0xba, 0x44,
-	0x05, 0x6c, 0xa4, 0x2b, 0x44, 0xe5, 0x6b, 0xcb, 0x1e, 0xb0, 0x51, 0xe7, 0x52, 0x0a, 0xa9, 0xf2,
-	0x8d, 0x53, 0x77, 0x08, 0x7f, 0x05, 0x38, 0x13, 0xf5, 0xad, 0xf5, 0x3b, 0x07, 0x25, 0x67, 0xad,
-	0x2d, 0x67, 0x43, 0x3d, 0x42, 0xf7, 0x21, 0x2e, 0xc5, 0xd0, 0x69, 0x5b, 0x4c, 0x44, 0x1d, 0x30,
-	0xac, 0x6a, 0xba, 0x92, 0xdb, 0x52, 0x22, 0xea, 0x00, 0xfe, 0x19, 0xc0, 0x8a, 0xf2, 0x52, 0xc8,
-	0xea, 0x6f, 0xf3, 0xa2, 0xa9, 0x79, 0xaf, 0x61, 0xd3, 0x72, 0xcd, 0x2a, 0xa6, 0x59, 0x1e, 0x9e,
-	0x44, 0xdb, 0xa3, 0xd3, 0x07, 0xc4, 0x3d, 0x24, 0x9f, 0x3d, 0xff, 0xb1, 0xd3, 0x72, 0x4f, 0x0f,
-	0x61, 0x26, 0xf3, 0x96, 0x2b, 0xc5, 0x6a, 0x67, 0x6b, 0x42, 0x47, 0x58, 0xbc, 0x87, 0x74, 0xf6,
-	0x08, 0xdd, 0x85, 0xe8, 0x1b, 0xdf, 0xfb, 0x02, 0xcd, 0xd1, 0xa4, 0x7b, 0xcd, 0xae, 0x06, 0x6e,
-	0x6b, 0x4b, 0xa8, 0x03, 0xef, 0xc2, 0xb7, 0x01, 0x7e, 0x02, 0xc7, 0x5f, 0x24, 0x2b, 0xf9, 0x68,
-	0x50, 0x06, 0x61, 0x53, 0xf9, 0xa7, 0x61, 0x53, 0xe1, 0x17, 0x90, 0xfa, 0x7b, 0x3f, 0x15, 0x8f,
-	0x20, 0x56, 0x3d, 0xeb, 0xcc, 0xa0, 0x99, 0xbc, 0x63, 0x72, 0xde, 0xb3, 0x8e, 0x3a, 0x0e, 0xff,
-	0x0e, 0x60, 0x69, 0xb0, 0xf9, 0xa0, 0x36, 0xcf, 0xbc, 0x92, 0x03, 0x5e, 0x3c, 0x1c, 0xc5, 0x8d,
-	0xe7, 0x3d, 0x93, 0xdc, 0x9b, 0x9b, 0x50, 0x8f, 0x10, 0x82, 0x65, 0xc7, 0x5a, 0x67, 0x6e, 0x42,
-	0xed, 0x79, 0x3a, 0x6f, 0xf1, 0x7c, 0xde, 0x0a, 0xd8, 0x54, 0x83, 0x64, 0xba, 0x11, 0x9d, 0x9f,
-	0x95, 0x03, 0x46, 0xbb, 0x89, 0xd1, 0x6b, 0x9b, 0xf0, 0x3d, 0x9b, 0xf0, 0xbf, 0x6c, 0xfe, 0x2f,
-	0x33, 0x4f, 0x7f, 0x04, 0x10, 0x7f, 0x30, 0x2b, 0x8d, 0x9e, 0x42, 0x74, 0x26, 0x6a, 0x74, 0x44,
-	0x6e, 0x66, 0xaf, 0x58, 0xfb, 0x16, 0xe3, 0xc5, 0xab, 0x00, 0x3d, 0x87, 0x95, 0x5b, 0x61, 0x94,
-	0x91, 0xd9, 0xda, 0x17, 0x77, 0xc8, 0x7c, 0xb7, 0xf1, 0x02, 0x6d, 0x21, 0xb6, 0xab, 0x89, 0x52,
-	0x32, 0xdd, 0xe6, 0x22, 0x23, 0xb3, 0x8d, 0x75, 0x91, 0xb6, 0x5d, 0x28, 0x25, 0xd3, 0xb6, 0x16,
-	0x19, 0x99, 0x75, 0x11, 0x2f, 0x2e, 0x56, 0xf6, 0xaf, 0xf3, 0xe6, 0x4f, 0x00, 0x00, 0x00, 0xff,
-	0xff, 0xc7, 0x3f, 0xbe, 0xe3, 0xa7, 0x04, 0x00, 0x00,
+	// 595 bytes of a gzipped FileDescriptorProto
+	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x09, 0x6e, 0x88, 0x02, 0xff, 0xa4, 0x54, 0x5b, 0x6e, 0xd3, 0x40,
+	0x14, 0x8d, 0x63, 0x3b, 0x71, 0x6e, 0x1e, 0x54, 0xc3, 0x43, 0x56, 0x78, 0xca, 0x12, 0x52, 0x78,
+	0x39, 0x10, 0x7e, 0x10, 0xfc, 0xa1, 0x22, 0x81, 0x04, 0xad, 0x34, 0x4d, 0x17, 0x30, 0xb5, 0x47,
+	0xa9, 0xa1, 0xf6, 0x98, 0x99, 0x71, 0xa5, 0xac, 0x85, 0x15, 0xf0, 0xc7, 0x66, 0xd8, 0x0f, 0xf3,
+	0x72, 0x1a, 0x0b, 0xa1, 0x7e, 0xf0, 0x77, 0xcf, 0xf5, 0x99, 0x33, 0xf7, 0x9e, 0x9c, 0x0c, 0xa4,
+	0x65, 0x91, 0x71, 0xb6, 0xdc, 0xb0, 0x17, 0xb6, 0xc8, 0xe9, 0x59, 0xb3, 0x59, 0x0a, 0xca, 0x2f,
+	0x8b, 0x8c, 0x2e, 0x6b, 0xce, 0xa4, 0xeb, 0xa5, 0xa6, 0x4e, 0x9e, 0xc0, 0xf4, 0x23, 0x25, 0x17,
+	0xf2, 0x1c, 0xd3, 0xef, 0x0d, 0x15, 0x12, 0xc5, 0x30, 0x74, 0xec, 0xd8, 0x7b, 0xe4, 0x2d, 0x46,
+	0xb8, 0x85, 0xc9, 0x02, 0x66, 0x2d, 0x55, 0xd4, 0xac, 0x12, 0x14, 0xdd, 0x81, 0x81, 0x90, 0x44,
+	0x36, 0xc2, 0x51, 0x1d, 0x52, 0xcc, 0xc9, 0x89, 0xaa, 0xc4, 0xf5, 0x9a, 0xbf, 0x3d, 0x98, 0x3a,
+	0xaa, 0xd3, 0xbc, 0x07, 0x23, 0x59, 0x94, 0xea, 0x14, 0x29, 0x6b, 0xc3, 0x0e, 0xf0, 0x55, 0xc3,
+	0x28, 0x49, 0xc2, 0x25, 0xcd, 0xe3, 0xbe, 0xf9, 0xd6, 0x42, 0x3d, 0x4b, 0x53, 0x6b, 0x62, 0xec,
+	0x9b, 0x0f, 0x0e, 0xe9, 0x7e, 0x49, 0x4b, 0xc6, 0xb7, 0x71, 0x60, 0xfb, 0x16, 0x69, 0x25, 0x79,
+	0xce, 0x29, 0xc9, 0x45, 0x1c, 0x5a, 0x25, 0x07, 0xd1, 0x0c, 0xfa, 0x9b, 0x2c, 0x1e, 0x98, 0xa6,
+	0xaa, 0xd0, 0x1c, 0x22, 0x6e, 0x17, 0x11, 0xf1, 0xd0, 0x74, 0x77, 0x58, 0xab, 0x53, 0xce, 0x19,
+	0x17, 0x71, 0x64, 0xd5, 0x2d, 0x4a, 0xbe, 0x02, 0x7c, 0x66, 0x9b, 0x6b, 0xf7, 0xb7, 0x0e, 0xaa,
+	0x6b, 0x4b, 0xb3, 0x4e, 0x84, 0x1d, 0x42, 0xb7, 0x20, 0xcc, 0x58, 0x53, 0x49, 0xb3, 0x8c, 0x8f,
+	0x2d, 0xd0, 0x5d, 0x51, 0x54, 0x4a, 0x25, 0xb0, 0x5d, 0x03, 0x92, 0x5f, 0x1e, 0x0c, 0x30, 0xcd,
+	0x18, 0xcf, 0xff, 0x36, 0xcf, 0xdf, 0x37, 0xef, 0x15, 0x44, 0x25, 0x95, 0x24, 0x27, 0x92, 0xa8,
+	0xeb, 0xfc, 0xc5, 0x78, 0x75, 0x3b, 0xb5, 0x07, 0xd3, 0x2f, 0xae, 0xff, 0xa1, 0x92, 0x7c, 0x8b,
+	0x77, 0x34, 0x3d, 0xb9, 0x3a, 0x2d, 0xc8, 0xc6, 0xda, 0xaa, 0x26, 0x77, 0x70, 0xfe, 0x0e, 0xa6,
+	0x9d, 0x43, 0xe8, 0x00, 0xfc, 0x6f, 0x74, 0xeb, 0x16, 0xd4, 0xa5, 0x1e, 0xf7, 0x92, 0x5c, 0x34,
+	0xd4, 0xec, 0x36, 0xc2, 0x16, 0xbc, 0xed, 0xbf, 0xf1, 0x92, 0x07, 0x30, 0x59, 0x73, 0x92, 0xd1,
+	0xd6, 0x20, 0x65, 0x79, 0x91, 0xbb, 0xa3, 0xaa, 0x4a, 0x9e, 0xc3, 0xd4, 0x7d, 0x77, 0xa9, 0xb8,
+	0xab, 0x36, 0xaf, 0x49, 0xa5, 0x83, 0xa6, 0xe7, 0x0e, 0xd3, 0x13, 0x85, 0xb0, 0xed, 0x25, 0x3f,
+	0xfa, 0x10, 0x68, 0xac, 0x2f, 0x94, 0xfa, 0x98, 0x53, 0xb2, 0xc0, 0x89, 0xf7, 0x5b, 0x71, 0xed,
+	0x79, 0x4d, 0x38, 0x75, 0xe6, 0xaa, 0xd4, 0x5a, 0x84, 0x10, 0x04, 0x15, 0x29, 0xad, 0xb9, 0x23,
+	0x6c, 0xea, 0xfd, 0xbc, 0x85, 0xdd, 0xbc, 0xa9, 0x54, 0xe4, 0x0d, 0x27, 0xb2, 0x60, 0x95, 0xcb,
+	0xca, 0x0e, 0xa3, 0xe5, 0x9e, 0xd1, 0x43, 0x33, 0xf0, 0x4d, 0x33, 0xf0, 0x3f, 0x6d, 0xbe, 0x0f,
+	0x81, 0xdc, 0xd6, 0xd4, 0x84, 0x68, 0xb6, 0x1a, 0x19, 0xf2, 0x5a, 0x35, 0xb0, 0x69, 0xff, 0x97,
+	0xd7, 0x4f, 0x1f, 0x43, 0xd4, 0xca, 0xa1, 0x31, 0x0c, 0x3f, 0x1d, 0xbd, 0x3f, 0x3e, 0x3d, 0x3a,
+	0x3c, 0xe8, 0xa1, 0x09, 0x44, 0xc7, 0xa7, 0x6b, 0x8b, 0xbc, 0xd5, 0x4f, 0x0f, 0xc2, 0x43, 0xfd,
+	0x30, 0xa0, 0x87, 0xe0, 0xab, 0xec, 0xa2, 0x71, 0x7a, 0x95, 0xe0, 0xf9, 0xd0, 0x05, 0x25, 0xe9,
+	0xbd, 0xf4, 0xd0, 0x33, 0x18, 0xd8, 0x87, 0x00, 0xcd, 0xd2, 0xce, 0xe3, 0x31, 0xbf, 0x91, 0x76,
+	0x5f, 0x88, 0xa4, 0x87, 0x16, 0x10, 0x9a, 0x3f, 0x38, 0x9a, 0xa6, 0xfb, 0x6f, 0xc2, 0x7c, 0x96,
+	0x76, 0xfe, 0xf7, 0x96, 0x69, 0x7e, 0x74, 0xc5, 0xdc, 0x0f, 0x87, 0x62, 0x76, 0xb2, 0x90, 0xf4,
+	0xce, 0x06, 0xe6, 0xed, 0x7a, 0xfd, 0x27, 0x00, 0x00, 0xff, 0xff, 0xbc, 0xab, 0x72, 0x03, 0xed,
+	0x04, 0x00, 0x00,
 }
diff --git a/debug/service/proto/debug.proto b/debug/service/proto/debug.proto
index 81eb44b8..7516651e 100644
--- a/debug/service/proto/debug.proto
+++ b/debug/service/proto/debug.proto
@@ -57,12 +57,12 @@ message LogRequest {
 
 // Record is service log record
 message Record {
-        // timestamp of log record
-        int64 timestamp = 1;
-        // record metadata
-        map<string,string> metadata = 2;
-        // message
-        string message = 3;
+    // timestamp of log record
+    int64 timestamp = 1;
+    // record metadata
+    map<string,string> metadata = 2;
+    // message
+    string message = 3;
 }
 
 message TraceRequest {
@@ -75,6 +75,11 @@ message TraceResponse {
 }
 
 
+enum SpanType {
+    INBOUND = 0;
+    OUTBOUND = 1;
+}
+
 message Span {
 	// the trace id
 	string trace = 1;
@@ -90,4 +95,5 @@ message Span {
 	uint64 duration = 6;
 	// associated metadata
 	map<string,string> metadata = 7;
+	SpanType type = 8;
 }
diff --git a/debug/trace/trace.go b/debug/trace/trace.go
index efb8c432..12a6ccbf 100644
--- a/debug/trace/trace.go
+++ b/debug/trace/trace.go
@@ -3,8 +3,9 @@ package trace
 
 import (
 	"context"
-	"github.com/micro/go-micro/v2/metadata"
 	"time"
+
+	"github.com/micro/go-micro/v2/metadata"
 )
 
 // Tracer is an interface for distributed tracing
@@ -17,6 +18,16 @@ type Tracer interface {
 	Read(...ReadOption) ([]*Span, error)
 }
 
+// SpanType describe the nature of the trace span
+type SpanType int
+
+const (
+	// SpanTypeRequestInbound is a span created when serving a request
+	SpanTypeRequestInbound SpanType = iota
+	// SpanTypeRequestOutbound is a span created when making a service call
+	SpanTypeRequestOutbound
+)
+
 // Span is used to record an entry
 type Span struct {
 	// Id of the trace
@@ -33,6 +44,8 @@ type Span struct {
 	Duration time.Duration
 	// associated data
 	Metadata map[string]string
+	// Type
+	Type SpanType
 }
 
 const (
diff --git a/util/wrapper/wrapper.go b/util/wrapper/wrapper.go
index 28510443..9f211a92 100644
--- a/util/wrapper/wrapper.go
+++ b/util/wrapper/wrapper.go
@@ -63,6 +63,7 @@ func (c *clientWrapper) Publish(ctx context.Context, p client.Message, opts ...c
 func (c *traceWrapper) Call(ctx context.Context, req client.Request, rsp interface{}, opts ...client.CallOption) error {
 	newCtx, s := c.trace.Start(ctx, req.Service()+"."+req.Endpoint())
 
+	s.Type = trace.SpanTypeRequestOutbound
 	err := c.Client.Call(newCtx, req, rsp, opts...)
 	if err != nil {
 		s.Metadata["error"] = err.Error()
@@ -122,6 +123,7 @@ func TraceHandler(t trace.Tracer) server.HandlerWrapper {
 
 			// get the span
 			newCtx, s := t.Start(ctx, req.Service()+"."+req.Endpoint())
+			s.Type = trace.SpanTypeRequestInbound
 
 			err := h(newCtx, req, rsp)
 			if err != nil {