To lengthen the lifetime of electrical vehicle charging power, there is an urgent need to replace the DC-link electrolytic capacitors in electrical vehicle charging power supply by non-electrolytic capacitors. This paper proposes a new method to model ACM boost PFC circuit including main circuit and control system. The close-loop transfer function of output voltage variation with respect to input voltage perturbation is obtained, then the attenuation coefficient for 100Hz twice line frequency ripple voltage is calculated. At last, both simulation by SABER and experiments validate the standpoints.