The tribological properties of TC4-DT alloy at different temperatures(20,300,500 ℃) are studied. The friction and the wear experiments are performed on TC4-DT alloy by the friction and wear tester,and the effects of temperature on the friction coefficient and the wear ratio are analyzed. Moreover, the changes of morphology and chemical elements on wear scar and the wear mechanism of TC4-DT alloy are discussed by the means of scanning electron microscope(SEM), energy dispersive spectrometer(EDS) and so on. The results show that:the oxide film appears on the surface of TC4-DT alloy,the friction coefficient of TC4-DT alloy decreases from 0.493 to 0.278 with the rise of temperature, the wear scar of TC4-DT alloy becomes narrower and shallower, and the wear ratio decreases a lot with the increase of temperature. The primary wear mechanism of TC4-DT alloy is abrasive wear and adhesive wear, along with fatigue wear at the temperature of 20 ℃,and that is delaminatiom wear and oxidation wear at the temperatures of 300, 500℃,along with a little abrasive wear and adhesive wear.