Abstract: Addressing the issue of distance detection distortion caused by visual sensor blind zones and enhancing the vehicle stability of the steer-by-wire system under chaotic factors, a fuzzy control method based on ultrasonic radar ranging is proposed. The safety distance is measured by ultrasonic radar, with the ultrasonic velocity and time being corrected during ranging. The current response state of the steer-by-wire system is determined by using a two-degree-of-freedom model to estimate the yaw rate and center of mass sideslip angle with safety distance as the constraint condition. A fuzzy controller is utilized, where the errors and error rates between the ideal and actual values of the vehicle′s safety distance, yaw angle, and sideslip angle monitored by the radar are inputted, and the control parameters of the steering system are adjusted in real-time through fuzzy rules to achieve stability control under ultrasonic radar ranging. Simulation results demonstrate that the distance measurement results of the ultrasonic radar after parameters correction are more accurate; the proposed method exhibits extremely low overshoot and response time when applied to the steer-by-wire system; the difficulty of vehicle stability control increases with vehicle speed, and the proposed method can follow the speed to change the transmission ratio of vehicle steering, ensuring the safety of vehicle steering.