diff --git a/dm/config/task.go b/dm/config/task.go
index 9b18d7a457..a9db02bd2f 100644
--- a/dm/config/task.go
+++ b/dm/config/task.go
@@ -722,6 +722,7 @@ func checkDuplicateString(ruleNames []string) []string {
 
 // AdjustTargetDBSessionCfg adjust session cfg of TiDB
 func AdjustTargetDBSessionCfg(dbConfig *DBConfig, version utils.TiDBVersion) {
+	log.L().Info("in adjust target db session cfg")
 	lowerMap := make(map[string]string, len(dbConfig.Session))
 	for k, v := range dbConfig.Session {
 		lowerMap[strings.ToLower(k)] = v
diff --git a/dm/master/server.go b/dm/master/server.go
index 22c78ecef0..55d5401af3 100644
--- a/dm/master/server.go
+++ b/dm/master/server.go
@@ -1256,6 +1256,7 @@ func adjustTargetDB(ctx context.Context, dbConfig *config.DBConfig) error {
 		cfg.Password = utils.DecryptOrPlaintext(cfg.Password)
 	}
 
+	log.L().Info("in adjust target db")
 	toDB, err := conn.DefaultDBProvider.Apply(cfg)
 	if err != nil {
 		return err
@@ -1266,6 +1267,7 @@ func adjustTargetDB(ctx context.Context, dbConfig *config.DBConfig) error {
 		toDB.Close()
 		return err
 	}
+	log.L().Info("get version: ", zap.String("tidb version", value))
 
 	version, err := utils.ToTiDBVersion(value)
 	// Do not adjust if not TiDB