Abstract: The Ni-based alloy coatings were prepared on the substrate of 45 steel by flame remelting, plasma surfacing and intermediate frequency induction remelting with commercial Ni60 alloy powder as coating material, respectively. The phase composition, microstructure,microhardness and high-temperature wear resistance of the coatings were studied. The results show that Ni-based alloy coatings with low porosity were obtained. The main hard phases of coatings prepared by flame remelting and intermediate frequency induction remelting were carbides which distributed uniformly. The grains of coatings prepared by intermediate frequency induction remelting were relatively small, and the microhardness was relatively high. The grains of the coating prepared by plasma surfacing were big; the hard phases mainly consisted of borides and distributed unevenly; the coating had the lowest microhardness. The coating prepared by intermediate frequency induction remelting had excellent high-temperature wear resistance, and the wear mechanism was adhesive wear and abrasive wear; the high-temperature wear resistance of the coating prepared by flame remelting was not good, and the main wear mechanism was adhesive wear. The coating prepared by plasma surfacing had the worst high-temperature wear resistance, and the wear mechanism was adhesive wear and fatigue wear.