This paper proposed the new design ideas and methods of fractional PIλ controller to compensate the deficiency of traditional PI in performance. A direct current decoupling control strategy based on double closed loop is used in the system, the fractional PIλ controller of the double loop use amplitude and phase margin method to tune the parameters of KP, KI and . The simulation results show that the APF based on fractional PIλ controller has a better dynamic and static performance and a stronger robustness, at the same time, the effect of filtering becomes better. Compared with the integer order system in mutation load condition, the factional order PI controller can do better to track the current of inner loop and steady the voltage of outer loop.