Abstract: Wear behaviors of TC11 alloy pin sliding against GCr15 disk with different hardness or W6Mo5Cr4V2 disk were investigated at 25℃, 400℃ and 600℃. The morphologies, cross-section morphologies, composition and structure of worn surfaces of TC11 alloy were observed and analyzed by using scanning electron microscopy, energy dispersive spectrum and X-ray diffraction. The results show that wear rates of TC11 alloy were high and increased with an increase of load at 25℃, adhesive wear and abrasive wear prevailed. At 400℃, worn surface was covered with black smooth oxides for TC11 sliding against GCr15 (low hardness), and the main wear mechanism was mild oxidative wear. In sliding against GCr15 (high hardness) at 50 and 150 N, worn surface showed the characteristics of black smooth oxides and furrow, which indicate the mild oxidative wear and abrasive wear, at 250 N, adhesive wear and abrasive wear were dominated. The furrows on the worn surface of TC11 alloy indicate abrasive wear in sliding against W6Mo5Cr4V2. At 600℃, wear rates were low and wear rates of TC11 alloy sliding against GCr15 with two different hardness were both lower than that against W6Mo5Cr4V2, and mild oxidative wear prevailed. At 25 and 600℃, wear mechanism was the same for TC11 alloy against different counterface materials. At 400℃, wear mechanism varied from counterface material to counterface material of TC11 alloy.