diff --git a/tools/demo.py b/tools/demo.py
index 0cac9cb59..d5214e104 100644
--- a/tools/demo.py
+++ b/tools/demo.py
@@ -25,13 +25,13 @@
 def make_parser():
     parser = argparse.ArgumentParser("YOLOX Demo!")
     parser.add_argument(
-        "demo", default="image", help="demo type, eg. image, video and webcam"
+        "--demo", default="image", help="demo type, eg. image, video and webcam"
     )
-    parser.add_argument("-expn", "--experiment-name", type=str, default=None)
-    parser.add_argument("-n", "--name", type=str, default=None, help="model name")
+    parser.add_argument("-expn", "--experiment-name", type=str, default="yolox-s")
+    parser.add_argument("-n", "--name", type=str, default="yolox-s", help="model name")
 
     parser.add_argument(
-        "--path", default="./assets/dog.jpg", help="path to images or video"
+        "--path", default="./assets/001.jpg", help="path to images or video"
     )
     parser.add_argument("--camid", type=int, default=0, help="webcam demo camera id")
     parser.add_argument(