Under the same working conditions, comparedwith the standard excavator, the fuel consumptionof the test prototype with the principle ofhydraulic-gas energy storage driving is reducedby 17.1%, and the working efficiency is increasedby 20.7%. Suppose a machine works 8 hours aday, a single hydraulic excavator can save up to47 L of fuel per day and reduce carbon dioxideemissions by 123.6 kg. The efficiency issignificantly improved while the energyconsumption of the whole machine is reduced.The carbon dioxide emission is effectivelyreduced