Abstract: This paper focuses on the fretting wear behavior of Ti-Al-Zr alloy carried out on a high precision hydraulic fretting wear test rig respectively at ambient and high temperature（400℃）.An experimental layout was designed to perform analysis of the friction coefficient,wear volume and morphology of the worn surface and cross-sections,and investigate the mechanism of fretting wear and wear debris.Experimental testing shows that friction coefficient at 400℃,compared with the ambient,was higher in initial stage,but both were little difference observed in steady stage.The wear volume at 400℃,under the same normal loads and displacement amplitudes,was larger than that at room temperature,and the wear increased with the increase of normal loads at the same temperature.At ambient,the damage mechanism of Ti-Al-Zr alloy was mainly delamination and abrasive wear,while the damage mechanism at 400℃ was primarily the combination of delamination,oxidative and adhesive wear.Based on the results,tribologically transformed structure played an important role in the fretting wear models.