Laser cladding technology was used to cladding cobalt WC composite cladding layer on 304 stainless steel substrate. Micro-Vickers hardness tester and friction and wear tester were used to test and analyze the hardness and friction and wear properties of the cladding layer. WC content, laser power and scanning speed were selected as process parameters. Friction and wear, friction coefficient, and surface hardness were optimized. Then L12 (34) orthogonal experiment was designed, the experimental results were analyzed by range anlysis, then the optimal process parameters were obtained. The optimal process parameters are as follows: WC content is 30%, laser power is 4 500 W, scanning speed is 8 mm/s.