WCp reinforced Ni-Cr-B-Si-C composite coatings were deposited on AISI1045 steel by laser. The microstructure of the typical coating containing 30vol-% WC particulates was investigated using XRD, SEM and TEM. It was found that partial WC dissolved and decomposed in the laser melt pool during the melting stage of the cladding. The rapidly solidified microstructure of the laser melt is composed of metastable bar-like α-W2C, blocky β-W2C and quadrilateral η1 carbide M6C precipitates distributed in Ni/Ni3B lamellar eutectic. Dry sliding wear tests suggested that the composite coating containing about 30vol-% WC particulates has the highest wear resistance.