The precise control for subsea tree is the key point to ensure subsea production running normally.Based on the research for API standards and operating parameters of subsea tree valve actuator,hydraulic control system for subsea tree was designed,including hydraulic power unit and subsea control module.Then the key components were selected and the main parameters of the hydraulic system were calculated.Based on system requirements,AMESim software was used for modeling and simulation of the opening and closing processes of subsea tree valve actuator.It is proved that the designed hydraulic system can meet the control requirements of subsea tree.