Aimed at the problem of early failure of the shaft-end mechanical face seals in the accessory gearbox of aero-engines,an improved method of configuring the laser-face grooves on the seal face was proposed,and experimental methods were utilized to study the friction and wear characteristics,the thermal characteristics and the leakage features of the seal under the condition of oil-injected lubrication.The test assembly that simulates the oil-injected condition was designed,and the integrated hydraulic station capable of heating the oil was customized.Tests under variable operating conditions and long-term steady-state operating conditions were carried out.The results show that there is no obvious wear on the seal faces of the moving and static rings after operation under variable and steady working conditions.When the medium temperature is relatively stable,the temperature of the moving ring and the shaft sleeve can remain stable.During the whole test,the mechanical seal has no leakage,indicating that the laser-face mechanical seal has good thermal characteristics and sealing effect under the condition of oil-injected lubrication.