Four-wheel positioning automatic adjustment technology: It is a kind of automatic technology that USES four-wheel automatic adjustment equipment to simulate the actual installation state of various rear auxiliary frame, adjust and measure the parameters of its toe angle, camber angle and brake disc end jump, etc. It solves the problem of time consuming, laborious and difficult to guarantee the accuracy and consistency of manual adjustment, improves the safety, stability and control of vehicle driving, and reduces the abnormal wear and oil consumption of tires.