Abstract: In view of the constant speed control problem of variable displacement motor,this paper proposes a hydraulic wind turbine speed control method based on the dynamic matrix control（DMC）prediction control,and analyzes influence of predicted horizon and control horizon on the speed control using the Simulink-AMESim. The simulation experimental results show that the DMC-based predictive control method improves the performance of the hydraulic turbine system speed control and provides theoretical guidance for subsequent engineering application.