Abstract: Cl60 steel wheel samples were partrally repaired by laser cladding 304L stainless steel. The friction and wear properties of repaired wheel samples under different temperature and relative humidity conditions (25 ℃, 60%; 50 ℃, 60%; 50 ℃, 90%) were studied. The results show that the higher the temperature, the smaller the stable friction factor; the relative humidity had almost no effect on the stable friction factor at 50 ℃. The higher the temperature or the lower the relative humidity, the greater the wear mass loss and crack length and angle of the partical repaired wheel. Under the 25 ℃ and 60% relative humidity condition, the bond zone between the cladding layer and the matrix on surface of the wheel had large material spalling and multi-layer cracks with small angles near the matrix, the cracks propagated inward, and the damage was serious. When the humidity was kept at 60% and the temperature increased to 50 ℃, the damage degree of the cladding layer was reduced, and there was an obvious dividing line and no obvious cracks in the bond zone. When the temperature increased to 50 ℃ and the relative humidity increased to 90%, no obvious damage existed in the cladding layer, the bond zon had a few spalling pits and the boundary between the cladding layer and matrix was clear.