Aiming at the wear problem of non-contact mechanical seal in the gas-liquid two-phase environment of aeroengine bearing cavity during startup,a lubricated seal end face structure with drainage groove on the high-pressure side was proposed,which can realize zero leakage.Based on the Reynolds equation,the flow field analysis model of the lubricating membrane was established,the mechanical seal performance with dynamic pressure-lubrication combination groove was solved and compared with that of the ordinary spiral groove mechanical seal.The influences of the lubricating groove machined on high-pressure side on the liquid film thickness,liquid film stiffness,leakage rate and friction performance 〖JP2〗were discussed.The accuracy of the calculation and the wear reduction effect of the end face were verified by the high-〖JP〗speed performance test and friction and wear test.The friction and wear test results of the end face structure in the low-speed stage show that the sealing end face with the combined groove can effectively reduce the friction coefficient of the sealing end face by 50% to 75% under the same start-stop working conditions.The test results of high-speed performance show that the mechanical seal with combined groove and only dynamic pressure groove can maintain the ideal negative leakage rate within the working conditions,indicating that the gas-liquid two-phase lubrication mechanical seal can be in the ideal pumping state in the working environment and achieve the absolute sealing effect of lubricating oil.Therefore,the end structure of the mechanical seal combined with the outer deep groove and the dynamic pressure shallow groove can significantly improve the friction and wear of the end face,which provides a reference for the end face anti-wear optimization design of gas-liquid two-phase mechanical seal in high-speed and ultra-high-speed bearing cavities.