diff --git a/deploy/slim/quantization/export_model.py b/deploy/slim/quantization/export_model.py
index 0cb86108d2..34cf80f5e5 100755
--- a/deploy/slim/quantization/export_model.py
+++ b/deploy/slim/quantization/export_model.py
@@ -76,7 +76,7 @@ def main():
     }
     FLAGS = ArgsParser().parse_args()
     config = load_config(FLAGS.config)
-    merge_config(FLAGS.opt)
+    config = merge_config(config, FLAGS.opt)
     logger = get_logger()
     # build post process
 
diff --git a/tools/export_model.py b/tools/export_model.py
index 9ed8e1b6ac..695af5c8bd 100755
--- a/tools/export_model.py
+++ b/tools/export_model.py
@@ -85,7 +85,7 @@ def export_single_model(model, arch_config, save_path, logger):
 def main():
     FLAGS = ArgsParser().parse_args()
     config = load_config(FLAGS.config)
-    merge_config(FLAGS.opt)
+    config = merge_config(config, FLAGS.opt)
     logger = get_logger()
     # build post process