In general, the active power filter is required to filter harmonic current within 50 times for ordinary industrial load. The traditional PI control can only be carried out on the dc componentSwithout difference; what’s more, the bandwidth is not enough. In order to solve this problem, the current loop controller which is feed forward decoupled in d - q synchronous rotating coordinates is improved by this article, and the hybrid control strategy which is composed of theSparallel connection of repetitive control and parameter self-adjusting fuzzy PI control is proposed, the parameters of repetitive control loop are optimized. For the traditional PI control strategy of voltage loop, because the setting of the PI parameters is rather complex, when the load of the system experiencesSacute fluctuation, it will be unable to maintain stability and then generate a lot of ripple, the robustness of the system will be worse, so this article will use the Fuzzy - PI dual-mode control strategy. For the control strategy above, the simulation model is set up on computer, the results show thatScompared to the traditional PI control strategy, the introduction ofScomposite control strategy has faster dynamic response speed and higher precision of harmonic compensation, and compared to the traditional PI control strategy in the dc side, the introduction of the Fuzzy - PI dual-mode control strategy hasSgood robustness and fast response.