Abstract: In order to study the effects of different emergency steering on driving safety,Trucksim software pack-age is used to simulate its impact and the tire load transfer rates (LTR )of coach buses were analyzed.After a vehicle dy-namics simulation test under multiple sets of road conditions,the effects of emergency steering under various driving speeds and steering operations on bus rollover are quantitatively analyzed.The simulation results show that the driving speed and steering rotation angle are negatively correlated with bus stability on dry pavements.The higher the speed,the greater the steering rotation angle,and LTR is closer to 1.The driving speed and steering extent are negatively correlated with bus skid stability on wet pavements.The higher the speed,the greater the steering extent,and the more the buses inclined to sideslip.In addition,the rollover risk or sideslip risk of the second turning is significantly higher than the risk of the first one.