Traditional pump control systems generate large energy consumption due to overflow and throttling losses,at the same time,it needs to be selected based on the peak power required by the system,which increases the system cost.Therefore,a hybrid actuator based on a digital hydraulic power management system with six pistons and 18 on/off control valves was proposed.A model-based controller was used to achieve effective control for the hybrid actuator and the control effect was also verified by simulation.A new type hybrid actuator system hydraulic circuit simplified diagram was constructed,and the mathematical models of the digital hydraulic power management system,hydraulic circuit and electric servo motor were established.A model-based controller was designed to achieve the optimal control for the piston and digital hydraulic power management system.MATLAB was used to simulate the hybrid actuator based on the digital hydraulic power management system,and compared and analyzed with the calculation results of traditional valve-controlled actuators.The results show that the piston position and speed tracking errors of the hybrid actuator based on the digital hydraulic power management system are reduced by 61% and 47%,respectively;the hydraulic accumulator of the hybrid actuator based on the digital hydraulic power management system can handle local power peaks,the input power of the system does not fluctuate greatly,and the energy consumption is also greatly reduced;the hybrid actuator based on the digital hydraulic power management system can effectively control the piston position and speed,and has excellent energy efficiency at the same time.