In order to reduce the throttling loss existing in the control valve port of the non-highest load actuator,and reduce the gravitational potential energy and kinetic energy of the actuator to be dissipated in the form of throttling loss,the principle of non-driven chamber pressure regulation was used to reduce the throttle loss caused by the load difference and to recover the working devices’ kinetic and potential energy to realize the low-pressure loss power distribution and transmission of the hydraulic excavator system;a system model was established for simulation analysis.The result shows that by using the new system,on the basis of ensuring the control performance,the pressure of the non-driven chamber of the non-highest load actuator can be increased through pressure regulation,thereby the pressure of the driven chamber can be increased,the throttle loss can be reduced and the energy can be recovered;the new system can be use to recover the actuators’ kinetic and potential energy,the energy-saving ratio of the whole machine to complete an excavation cycle is 13.22%.