It candirectly replace the original hydraulic cylinderwithout changing the boom structure. It issuitable for small machines driven by singlehydraulic cylinder [26] and large and mediumsizedmachines driven by two hydraulic cylinders[27, 28]. At present, the team has applied theprinciples proposed in the boom drive systems ofsmall hydraulic excavator [29] and mediumhydraulic excavator [30]. Simulation andexperimental research on the operationcharacteristics and energy consumptioncharacteristics of the boom are conducted [31].The existing experimental research is based onthe small hydraulic excavator, which does notinvolve the energy consumption of the wholemachine during the complete duty cycle.Compared with the small hydraulic excavator, thelarge hydraulic excavator has a large demand fordigging force, and the influence of the hydraulicgasenergy storage unit on the digging forcecannot be ignored. Therefore, this paper focuseson the efficient driving of large hydraulicexcavator boom with the hydraulic-gas energystorage drive method.A test prototype is built and the standard 90°loading duty cycle efficiency and fuelconsumption are tested.