In view of compensation requirement of series active power filter in the condition of low ripples, it analyzes the shortage of front feedback controll strategy and puts forward a strategy of two closed loops ontroll. The two closed loops control strategy is a new-style control strategy in series active power filter. By detecting the instantaneous voltage and the instantaneous current across the passive power filter as the reference signal of the active power filter, the compensation performance of the series active power filter is very obvious, also has nicer adaptability of load and anti-jamming. The experimental emulator in matlab verifies the compensation performance of the series active power filter.