Abstract: Taking the hydraulic system of a wave energy converter（WEC） with several generators as the research object,the composition and working principle of the hydraulic system are introduced,and the experimental study on two power generation control strategies are carried out through the self-made hydraulic test platform. The power generation control strategy of changing the opening of flow control valve is first tested. The results show that using this control strategy can stabilize the output voltage for a period of time and improve the power generation quality. Two methods based on hydraulic test platform to obtain the effective input electrical signal of the proportional flow control valve are also proposed. Secondly,the gradient power generation control strategy is realized by connecting generator sets to the output end of the hydraulic system. The data results confirm that the gradient power generation control strategy can effectively improve the instantaneous output power and enhance the adaptability of the WEC under different wave conditions. The conditions for realizing this control strategy in actual sea conditions are discussed preliminary.