In order to improve the smoothness and comfort of the vehicle, a simplified model of one-quarter vehicle is established for the semi-active suspension system, fuzzy control strategy is introduced, and PID (proportion integration differentiation) control is combined to solve the problem that the PID controller parameters cannot be changed and the control effect is not ideal. And through the software simulation analysis, at the same time under the same parameters with the PID algorithm control of the suspension and passive suspension were compared. The simulation results show that the semi-active suspension based on the fuzzy PID algorithm can better deal with the impact of uneven road on the vehicle, reduce the vertical vibration and improve the vehicle driving stability.