Abstract: CoCrFeNiMo-WC laser cladding layer was prepared on 316L stainless steel substrate by laser cladding technology. With the help of OM, XRD, SEM, microhardness tester, reciprocating wear tester, electrochemical workstation and corrosive wear tester, the forming quality, phase structure, microstructure, microhardness, abrasion, corrosion and corrosion and wear resistance of the cladding layer was analyzed. The results show that: during the laser cladding process,good metallurgical bonding is formed between the CoCrFeNiMo-WCx（x=0 wt%, 10 wt%, 20 wt%, 30 wt% and 40 wt%） laser cladding layer and the substrate, but the forming quality of the laser cladding layer declines with the increase of WC content;the microstructure of the laser cladding layer changes remarkably with the increase of WC content, which is transformed from feathery and petal-like dendritic crystals（x=0 wt%）. The microstructure of the laser cladding layer changes significantly with the increase of WC content, from feather-like and petal-like dendrites（x=0 wt%） to columnar and cellular crystals（x=10 wt%）,and further forms snowflake and fishbone organizations（x=20 wt%）, and ultimately forms a large number of dense dendrites（x≥30 wt%）, with a tendency to decrease and then increase grain size; with the increase of WC content, the phase structure of the fused cladding layer is FCC+σ phase for x≤10 wt%. x≥20 wt%. the carbides such as Fe₃W₃C, Co₃W₃C, W₂C and W₃C are generated in the cladding layer; with the increase of WC content, the hardness of the cladding layer increases, the wear rate decreases, and the corrosion resistance shows a tendency to increase first and then decrease. For the corrosion and wear resistance of the laser cladding layer,there is an optimum amount of WC added（x=20 wt%）.