In order to improve the trafficability of the non-road vehicles such as tractors in normal driving and working stages,this paper studied the ASR control strategy. Based on the combination of MATLAB / Simulink and Carsim,it established a tractor simulation model. This strategy updated the target slip rate in real time with the new method of road surface identification and used improved particle swarm optimization algorithm to adjust PID control parameters adaptively. Based on different pavement,a series of s...