The tribological law of dry sliding of slipper pair in axial piston pump under high temperature was studied by using Rtec friction and wear tester to simulate different working conditions such as temperature,load and speed.Through the friction coefficient and wear volume Friction coefficient and wear volume measured by test,the surface morphology and wear scar section curves measured by white light interference threedimensional surface profilometer,the lubrication behavior and friction and wear law were analyzed.The results show that at high temperature,the friction coefficient of slipper pair decreases with the increase of temperature and speed,and increases with the increase of load.The wear volume first increases and then decreases with the increase of temperature,and increases with the increase of load,and decreases with the increase of rotating speed.Temperature and load have significant effects on the depth of wear marks at high temperature,while the rotation speed has an impact on the depth and width of wear marks.It is found that under the condition of high temperature,the friction reduction and wear resistance effect of slipper pair is the best when the temperature is 300 ℃,the load is 50 N and the speed is 75 r/min.