Abstract: CoCr Ni W_xalloy coatings were successfully prepared on the surface of low carbon steel by laser cladding technique using Co, Cr, Ni and W powders as raw materials. The morphology and phase composition of the coatings were characterized by SEM, XRD and EDS. The friction and wear properties of the coatings were tested under dry friction and wear conditions. The microhardness and friction wear performance of the coating under dry friction and wear conditions were tested. The effects of different fractions of W element on the microstructure, hardness, and wear resistance of Co Cr Ni based entropy alloy coatings were studied. The results show that the cladding coating forms a good metallurgical bonding with the substrate, the surface dilution rate is low. However, when the W content increases to 9%, the cladding layer exhibits obvious defects such as cracks and pores. The CoCrNi alloy coating consists of FCC single-phase structure, and with the addition of W element, there are α-Co, precipitation phase M₆C and M₂₃C₆in the coating. And as the W content increases,the microstructure of the coating changes from dendrite and interdendritic structure to cellular structure and the precipitation at grain boundaries, the cellular structure of the coating containing 6% W is more uniform, the surface hardness of the coating reaches（652±65） HV0.1, the friction coefficient is minimum, and the wear resistance is best.