目前中学物理实验关于物体运动轨迹的研究,多数采用闪光照相、撞击痕迹等记录方式,实验器材分散,不能连续记录物体的运动轨迹,实验现象不直观.为了克服上述实验的缺点,笔者尝试着提供一种真实的,可记录抛体运动轨迹的装置,利用LED屏幕实时记录抛体运动轨迹,并显示出来.1实验装置的特点在保证不干扰抛体运动过程的情况下,采用红外传感技术,用非接触方式就能记录抛体运动轨迹,并在LED显示屏上显示出抛体运动实时轨迹. At present, the research on the trajectories of objects in high school physics experiment mostly adopts the methods of recording such as flash photography and impact marks, the experimental equipment is scattered and can not continuously record the trajectories of the objects, and the phenomena of the experiment are not intuitive.In order to overcome the shortcomings of the above experiments, A real, recordable trajectory of the projectile motion device, the use of LED screen real-time record of the projectile motion trajectory, and displayed.1 The characteristics of the experimental device to ensure non-interference projectile motion process circumstances, the use of infrared sensing technology , Non-contact method can record the trajectory of projectile movement, and shows the projectile movement real-time trajectory on the LED display.