Abstract: When the load current of a proton exchange membrane fuel cell changes,its inappropriate air inlet flow will result in oxygen starvation and reduce the output efficiency of the cell.In this way,a model of the air supply system is built,and the traditional PI control,fuzzy control and fuzzy PI control strategies are used to control the air inlet flow respectively.The difference between the actual and ideal air inlet flow of the cathode is taken as the input of the controller.The voltage of the air compressor is adjusted to control its speed,and then the air inlet flow is controlled to achieve closed-loop control.Taking the peroxide ratio change curve with step current as the observation object,the three control strategies are simulated and analyzed.The simulation results show that the three control strategies can shorten the original control time from 1.5 s to 0.5 s,in which the overshoot of the fuzzy control is the smallest.The energy consumption of the air compressor after fuzzy PI control shows the most significant decrease,which is 1.02% lower than that of the feedforward control.