Abstract: Through the numerical simulation method,the auxiliary cooling scheme of the hydrogen supply system is evaluated under the conditions of steady state and driving cycle. The simulation results show that the high expansion ratio of hydrogen is beneficial to reduce the energy consumption of the air conditioning system. When the ambient temperature is 45 ℃,the auxiliary cooling scheme can reduce the energy consumption of the air conditioning system by 5.4% under driving cycle in China for passenger vehicles. However,the auxiliary cooling scheme brings some challenges to the stable operation of the air conditioning system and the control of the cabin temperature.