diff --git a/deploy/slim/quantization/export_model.py b/deploy/slim/quantization/export_model.py
index 0cb86108d2275dc6ee1a74e118c27b94131975d3..34cf80f5e5566707a08d15ddeaaa51348dcd9acf 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 9ed8e1b6ace89ded030c946870551c8e078d7340..695af5c8bd092ec9a0ef806f8170cc686b194b73 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