The components of the steering system include: steering control mechanism, steering gear and steering transmission mechanism. The steering control mechanism is composed of steering wheel, steering shaft and steering column. The steering system is a device used to change or maintain the driving or reverse direction of the car. Its design requirements are: 1. When turning, the wheels should rotate around the instantaneous steering center; 2. The steering wheel has the ability of automatic return; 3. Avoid steering wheel vibration and steering wheel swing when driving; 4. The steering is sensitive and the turning diameter is small; 5. Easy to operate; 6. There should be a clearance adjustment mechanism in the steering gear and steering transmission mechanism; 7. The rotation direction of the steering wheel is consistent with the change of the driving direction.