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Three level active power filter The stability of harmonic compensation performance of active power filter (APF) system is poor under different loads. By analyzing the basic working principle of three-level APF, a repetitive fuzzy PI control method is given. The composite control method adopted the harmonic detection method of instantaneous reactive power theory to separate the fundamental current in the load current, and then controlled by repetitive fuzzy PI controller error signal between fundamental current and load current. Through MATLAB/Simulink simulation analysis, it is found that compared with repetitive control and fuzzy PI control, the tracking stability of repetitive fuzzy PI control three-level APF structure at different frequency points is improved, the incoming harmonic content is reduced，that is total harmonic distortion (THD). The method can be applied to industrial and commercial loads, makes up for the disadvantage that the system performance is affected by the load change when fuzzy PI control and repetitive control are used alone, and improves the robustness.