diff --git a/apm-network/src/main/proto/AggregatedMetricsService.proto b/apm-network/src/main/proto/AggregatedMetricsService.proto
new file mode 100644
index 000000000..ed4b9b264
--- /dev/null
+++ b/apm-network/src/main/proto/AggregatedMetricsService.proto
@@ -0,0 +1,24 @@
+syntax = "proto3";
+
+option java_multiple_files = true;
+option java_package = "org.skywalking.apm.network.trace.proto";
+
+import "Downstream.proto";
+
+service AggregatedMetricsService {
+    rpc collect (AggregatedMetrics) returns (Downstream) {
+    }
+}
+
+message AggregatedMetrics {
+    repeated Metric metrics = 1;
+}
+
+// In aggregated metric, every operation metric is aggregated in 1 seconds.
+message Metric {
+    int32 operationNameId = 1 ;
+    int32 timeWindow = 2;
+    int32 count = 3;
+    int32 latency = 4; // ms
+    repeated int32 topN = 5;
+}
diff --git a/apm-network/src/main/proto/JVMMetricsService.proto b/apm-network/src/main/proto/JVMMetricsService.proto
new file mode 100644
index 000000000..22680b686
--- /dev/null
+++ b/apm-network/src/main/proto/JVMMetricsService.proto
@@ -0,0 +1,13 @@
+option java_multiple_files = true;
+option java_package = "org.skywalking.apm.network.trace.proto";
+
+import "Downstream.proto";
+
+service JVMMetricsService {
+    rpc collect (JVMMetrics) returns (Downstream) {
+    }
+}
+
+message JVMMetrics {
+
+}
diff --git a/apm-network/src/main/proto/RegisterService.proto b/apm-network/src/main/proto/RegisterService.proto
new file mode 100644
index 000000000..773f224b8
--- /dev/null
+++ b/apm-network/src/main/proto/RegisterService.proto
@@ -0,0 +1,50 @@
+syntax = "proto3";
+
+option java_multiple_files = true;
+option java_package = "org.skywalking.apm.network.trace.proto";
+
+//register service for ApplicationCode, this service is called when service starts.
+service ApplicationRegisterService {
+    rpc register (ApplicationMetaInfo) returns (ApplicationRegiseredInfo) {
+    }
+}
+
+message ApplicationMetaInfo {
+    string applicationCode = 1;
+}
+
+message ApplicationRegiseredInfo {
+    int32 applicationId = 2;
+}
+
+//register service for ServiceName, Network address
+service DictionaryRegisterService {
+    rpc register (DictionaryRegisterMetaInfo) returns (DictionaryRegiseredInfo) {
+    }
+}
+
+message DictionaryRegisterMetaInfo {
+    repeated DictionaryRegisterElement elements = 1;
+}
+
+message DictionaryRegisterElement {
+    RegisterElementType type = 1;
+    string name = 2;
+}
+
+message DictionaryRegiseredInfo {
+    repeated DictionaryRegiseredElement elements = 1;
+}
+
+message DictionaryRegiseredElement {
+    RegisterElementType type = 1;
+    string name = 2;
+    int32 id = 3;
+}
+
+
+enum RegisterElementType {
+    ServiceName = 0;
+    NetworkAddress = 1;
+}
+
diff --git a/apm-network/src/main/proto/TraceSegment.proto b/apm-network/src/main/proto/TraceSegmentService.proto
similarity index 100%
rename from apm-network/src/main/proto/TraceSegment.proto
rename to apm-network/src/main/proto/TraceSegmentService.proto