Abstract: Laser cladding Ni Al WC alloy layer on the surface of chrome cast iron and alloy layer's micro structure and properties are studied. The chemical composition, the phase structure, the average micro hardness, the wear resistance and the corrosion resistance are analyzed for the Ni Al WC and the matrix, respectively. The results show that the metallurgical combination is achieved between the spray alloy layer and the surface of chrome cast iron, the chemical composition and micro structure in the surface layer of the specimen are changed basically, and the micro hardness, the wear resistance, the corrosion resistance in the surface layer are increased with a large range.