Abstract: The model deviation control method was applied in active power factor correction(APFC) to reduce buffeting of APFC system in practical application, the duty cycle of PWM was gotten according to the state equation of APFC,and single-phase Boost-APFC was taken as example to make Matlab simulation. The simulation results showed that the APFC control system with model deviation control method has good correction effect,small overshoot,and short response time.