To recover ancient Chinese south-pointing chariot,the principle of planetary gear trains and differential gear trains is studied. The structure of Lanchester south-pointing chariot is made of gear trains and body frame manufactured by 3 D printer. By analyzing the error of chariot,it has the disadvantages such as low accuracy. In order to reduce the error and improve the gear structure,motor and microcomputer control are applied to realize high-precision orientation on the plane. By further scenario analysis of chariot movement,its movement condition on 3 D surface can be known. To align error on the plane,a three dimensional checking calculation method is put forward. By monitoring the axle’s movement angle,south-pointing on the plane can be realized. The checked south-pointing chariot is suitable for most conditions,and has great market prospects in machinery manufacturing,national defense and other fields.