diff --git a/ApplicationRegisterService.proto b/ApplicationRegisterService.proto
index a3b8e3ad70f4c4230483e56d43be5fda9392cb43..8c824e798a3d740c3d3f6c20ca44b6e82cc581d5 100644
--- a/ApplicationRegisterService.proto
+++ b/ApplicationRegisterService.proto
@@ -26,6 +26,9 @@ import "KeyWithIntegerValue.proto";
 
 //register service for ApplicationCode, this service is called when service starts.
 service ApplicationRegisterService {
+    rpc registeredApplicationCheck (RegisteredApplication) returns (ApplicationCheckResult) {
+    }
+    
     rpc applicationCodeRegister (Application) returns (ApplicationMapping) {
     }
 }
@@ -37,3 +40,11 @@ message Application {
 message ApplicationMapping {
     KeyWithIntegerValue application = 1;
 }
+
+message RegisteredApplication {
+    int32 applicationId = 1;
+}
+
+message ApplicationCheckResult {
+    bool existed = 1;
+}