diff --git a/apm-network/src/main/proto/DiscoveryService.proto b/apm-network/src/main/proto/DiscoveryService.proto
index 4071b3f4b..c1a14bcfb 100644
--- a/apm-network/src/main/proto/DiscoveryService.proto
+++ b/apm-network/src/main/proto/DiscoveryService.proto
@@ -11,20 +11,34 @@ service InstanceDiscoveryService {
     rpc register (ApplicationInstance) returns (ApplicationInstanceMapping) {
     }
 
-    rpc registerRecover (ApplicationInstanceMapping) returns (Downstream) {
+    rpc heartbeat (ApplicationInstanceHeartbeat) returns (Downstream) {
+    }
+
+    rpc registerRecover (ApplicationInstanceRecover) returns (Downstream) {
     }
 }
 
 message ApplicationInstance {
     int32 applicationId = 1;
+    int64 registerTime = 2;
 }
 
 message ApplicationInstanceMapping {
     int32 applicationId = 1;
     int32 applicationInstanceId = 2;
+}
+
+message ApplicationInstanceRecover {
+    int32 applicationId = 1;
+    int32 applicationInstanceId = 2;
     int64 registerTime = 3;
 }
 
+message ApplicationInstanceHeartbeat {
+    int32 applicationInstanceId = 1;
+    int64 heartbeatTime = 2;
+}
+
 //discovery service for ServiceName by Network address or application code
 service ServiceNameDiscoveryService {
     rpc discovery (ServiceNameCollection) returns (ServiceNameMappingCollection) {
@@ -47,5 +61,4 @@ message ServiceNameMappingElement {
 message ServiceNameElement {
     string serviceName = 1;
     int32 applicationId = 2;
-}
-
+}
\ No newline at end of file