Abstract: To localize gas turbine gear oil for main retarder of naval vessel, alternative gas turbine gear oil was developed. The developed gear oil composes of PAO6, VHVI4, esters and appropriate antioxidant, antirust and anticorrosive, extreme pressure abrasion resistance additive and the quality of the gear oil meets the provisional qualification standard. The developed oil has an excellent performance in viscosity-temperature, oxidation stability, antirust and anticorrosion, anti-high temperature corrosion, hydrolytic stability and a suitable extreme pressure abrasion resistance.