diff --git a/demo/mono_det_demo.py b/demo/mono_det_demo.py
index 42416fd9f4..6e099927db 100644
--- a/demo/mono_det_demo.py
+++ b/demo/mono_det_demo.py
@@ -57,7 +57,6 @@ def parse_args():
 
     call_args['inputs'] = dict(
         img=call_args.pop('img'), infos=call_args.pop('infos'))
-    call_args.pop('cam_type')
 
     if call_args['no_save_vis'] and call_args['no_save_pred']:
         call_args['out_dir'] = ''
diff --git a/demo/multi_modality_demo.py b/demo/multi_modality_demo.py
index e3c28cdc48..4b3dbd4f86 100644
--- a/demo/multi_modality_demo.py
+++ b/demo/multi_modality_demo.py
@@ -60,7 +60,6 @@ def parse_args():
         points=call_args.pop('pcd'),
         img=call_args.pop('img'),
         infos=call_args.pop('infos'))
-    call_args.pop('cam_type')
 
     if call_args['no_save_vis'] and call_args['no_save_pred']:
         call_args['out_dir'] = ''
diff --git a/mmdet3d/apis/inferencers/base_3d_inferencer.py b/mmdet3d/apis/inferencers/base_3d_inferencer.py
index 6564325e8c..8b72da1a3e 100644
--- a/mmdet3d/apis/inferencers/base_3d_inferencer.py
+++ b/mmdet3d/apis/inferencers/base_3d_inferencer.py
@@ -167,6 +167,7 @@ def _dispatch_kwargs(self,
         kwargs['img_out_dir'] = out_dir
         kwargs['pred_out_dir'] = out_dir
         if cam_type != '':
+            kwargs['cam_type'] = cam_type
             kwargs['cam_type_dir'] = cam_type
         return super()._dispatch_kwargs(**kwargs)