diff --git a/robomaster_pi/robot_ros_odom.py b/robomaster_pi/robot_ros_odom.py
index c190beb043340715a0b5ec0c4410d73bd0839e7b..dc059e3b5a23c9839f9dd8d83c363b8cbe9f935b 100644
--- a/robomaster_pi/robot_ros_odom.py
+++ b/robomaster_pi/robot_ros_odom.py
@@ -42,6 +42,7 @@ class Robomaster_odom(Node):
     def __init__(self, ep_chassis):
         super().__init__("robomaster_odom")
         ep_chassis.sub_position(freq=10, callback=self.sub_position_handler)
+        print("sub")
     
 
     def sub_position_handler(position_info):