diff --git a/server/grpc_service.go b/server/grpc_service.go
index d3db45c8364..216611038e5 100644
--- a/server/grpc_service.go
+++ b/server/grpc_service.go
@@ -57,7 +57,7 @@ import (
 
 const (
 	heartbeatSendTimeout          = 5 * time.Second
-	maxRetryTimesRequestTSOServer = 3
+	maxRetryTimesRequestTSOServer = 6
 	retryIntervalRequestTSOServer = 500 * time.Millisecond
 	getMinTSFromTSOServerTimeout  = 1 * time.Second
 	defaultGRPCDialTimeout        = 3 * time.Second