Abstract: When a vehicle in high speed brakes at a corner, it will create a lateral outward inertia force.If the vehicle brakes suddenly at this time, a slippery road can not supply the enough friction force to stop the vehicle so as to cause the vehicle sideslip.In this paper, the author analyses the stress caused by sudden braking at a corner and the driving process, and builds a braking dynamic model.Software Simulink of Matlab is used to conduct the simulation research, which includes the influence of braking at a corner on the vehicle performance.Finally, more reasonable explanation and effective measures are put forward.