Abstract: The microstructurebonding strengthwear resistance and hardness values of the WC/CuMnNi coating prepared on the surface of 45 steel by brazing have been investigated in this work with the aid of microscope SEM HRB-hardness determiningEPMA and X-ray diffraction.The experimental results show that the microstructure of the composite coating is homogeneous,and an intermetallic compound exists at the interface between the substrate and the coating,leading to a higher bonding strength;the wear resistance of the composite coating is superior to that of the 45 steel quenched from 840 ℃ and tempered at 180 ℃.