Wave energy generation system，whose output power fluctuates randomly，has an important impact on the safety and stability of the power system.It is important to accurately predict the wave output power for the dispatch and control of main grid.In this paper，a complete transformation model from wave power is established for Archimedes wave swing（AWS）.The method of time series analysis is used to predict the wave data.Finally，the predicted wave data is employed into the established model to obtain the output power.Simulation studies and results show the effectiveness of the proposed method.