Abstract: In view of problem that active power filter based on one-cycle control can only compensate harmonic and reactive component simultaneously, a design scheme of active power filter based on one-cycle control and ip-iq detection method was proposed. Fundamental components including harmonic or reactive component or the both detected by ip-iq detection method are took as reference signal of one-cycle controller, signal of power current is took as input signal of one-cycle controller. The two signals generate compensation current through one-cycle controller, so as to realize the purpose of compensating harmonic individually or compensating harmonic and reactive component simultaneously. The simulation and experiment results validate feasibility of the scheme.