diff --git a/apm-network/src/main/proto/DiscoveryService.proto b/apm-network/src/main/proto/DiscoveryService.proto
index 420b3d6c9..4071b3f4b 100644
--- a/apm-network/src/main/proto/DiscoveryService.proto
+++ b/apm-network/src/main/proto/DiscoveryService.proto
@@ -20,8 +20,9 @@ message ApplicationInstance {
 }
 
 message ApplicationInstanceMapping {
-    int32 applicationInstanceId = 1;
-    int64 registerTime = 2;
+    int32 applicationId = 1;
+    int32 applicationInstanceId = 2;
+    int64 registerTime = 3;
 }
 
 //discovery service for ServiceName by Network address or application code