A pindisk hightemperature friction and abrasion tester was used to perform hightemperature abrasion tests on H13 steel conventionally quenched and tempered treated samples.The friction and wear properties of H13 steel were studied under the temperature of 400 ℃ to 600 ℃,the load of 50 N to 150 N and the speed of 50 r/min and 100 r/min.XRD,SEM,EDS,micro hardness tester were used to analyze the structure,morphology,composition and hardness of the wear surface and wear section of H13 steel,and the wear mechanism was discussed.The results show that under different experimental conditions,the wear rate of H13 steel is first decreased and then increased with the increase of temperature.The wear rate at 500 ℃ is the lowest,and the wear rate at 600 ℃ is lower than 400 ℃ at low speed,but it is opposite at high speed and high load.The wear rate of H13 steel is decreased first and then increased with the increasing of the load at low speed,and is increased monotonously at high speed.Severe wear occurs at the sliding conditions of 600 ℃,150 N and 100 r/min,while slight wear occurs at other sliding conditions.The oxides can be formed on the grinding surface of H13 steel at high temperature,while the high speed is not conducive to the formation of oxides on the grinding surface at high temperature,so that the same amount of oxides generated at high speed needs a higher temperature.The wear rate is decreased due to the effect of grinding at low and middle temperature,but at high temperatures,the matrix of H13 steel is reverted and recrystallized,resulting in poor mechanical properties,so the severe plastic extrusion of the matrix occurs,and the slight oxidation wear changes into severe oxidation wear.