diff --git a/paddlespeech/s2t/exps/u2/bin/train.py b/paddlespeech/s2t/exps/u2/bin/train.py
index 456efadae..b52d5e90b 100644
--- a/paddlespeech/s2t/exps/u2/bin/train.py
+++ b/paddlespeech/s2t/exps/u2/bin/train.py
@@ -21,8 +21,6 @@ from paddlespeech.s2t.training.cli import default_argument_parser
 from paddlespeech.s2t.training.cli import maybe_dump_config
 from paddlespeech.utils.argparse import print_arguments
 
-# from paddlespeech.s2t.exps.u2.trainer import U2Trainer as Trainer
-
 
 def main_sp(config, args):
     exp = Trainer(config, args)
diff --git a/paddlespeech/s2t/training/cli.py b/paddlespeech/s2t/training/cli.py
index 3c39dde18..741b95dff 100644
--- a/paddlespeech/s2t/training/cli.py
+++ b/paddlespeech/s2t/training/cli.py
@@ -75,7 +75,9 @@ def default_argument_parser(parser=None):
         "--debug",
         type=distutils.util.strtobool,
         default=False,
-        help="for debug.")
+        help="logging with debug mode.")
+    parser.add_argument(
+        "--dump_path", type=str, default=None, help="path to dump config file.")
 
     # train group
     train_group = parser.add_argument_group(