CoCrW matrix composites reinforced by nano-ZrO2 were prepared by powder metallurgy technology.The scanning electron microscope,energy spectrometer and X-ray diffractometer were used to analyze the microstructure and phases of composite materials，and the tribological properties of the composites from room temperature to 1 000 ℃ were studied by using a balldisk hightemperature tribotester when sliding against Si3N4 ball.The results show that the ZrO2 significantly improves the hardness of the composites.The friction coefficient of the composites first decreases slightly,then increases with the increase of temperature,and then decreases with the further increase of temperature.The wear rate first increases,then decreases and tends to be stable with the increase of temperature.The composites containing ZrO2 have lower friction coefficient and wear rate at high temperature,which indicates that ZrO2 ceramic particles significantly improve the high temperature wear resistance of the composites.At low temperature,the wear mechanism of CoCrW matrix composites reinforced by nano-ZrO2 is abrasive wear and plastic deformation,at high temperature,the wear mechanism is oxidation wear.