Abstract: In order to improve the surface property of H13 steel, Co42 anti-wear resistance coating was performed by laser cladding method on the surface of H13 steel. The dilution ratio, surface roughness, and the surface morphology of the samples obtained under different parameters were investigated. The proper parameters for laser cladding were as following: defocus value of 20mm, laser scan speed of 1.7mm/s, pulse width of 2.0ms, and pulse frequency of 30Hz. The microstructure of the coating was characterized as fine dendrites with a thickness of 230m. The microhardness presented a gradient decreased from the coating to the substrate. The microhardness in the coating was 650HV0.1, which was about 2.7 times of that of the substrate. The results show that the parameters including defocus value, laser scan speed, pulse frequency, and pulse width influence the above three properties of the coating. This result is helpful for improving friction stir welding technology.