Abstract: A Modified Grey Wolf Optimizer（MGWO）optimized by Fourier analysis method is proposed to optimize the output power control of ocean wave power system. On the basis of reserving the most essential characteristics of grey wolf optimizer,completely new strategies for instructing elite class wolves searching and overall wolves’ expansion are added,as well as encirclement formation strategy,hunting patterns and wolves organization are improved,in order to ensure that the MGWO algorithm can avoid trapped in local optimum due to the nonlinearity of buoy hydrodynamics. The Fourier analysis method is introduced to decompose the ocean incident wave and the response of motor moving components. The MGWO algorithm is used to solve the optimal motor control parameters corresponding to each wave component of incident wave in the buoy capture frequency range in order to capture the power carried in each wave component as mentioned to the most extent. The simulation shown that the strategy based on Fourier analysis method and modified grey wolf optimizer effectively achieves the maximum power point tracking of heaving buoy wave power system when feeding different simulated ocean incident wave.