Laser clad Ni -based alloy coating with 20vol% B₄CP(NiB₄C) on 16Mn steel substrate has been obtained by 5kW CO2 continuous wave laser. Microstructure and phase constitutes of the NiB4C coating have been studied, and micro - hardness and the performance of sliding wear of the NiB4C coating have been discussed in contrast to laser clad Ni - based alloy coating (Ni60). The result shows that the microstructure of NiB4C coating is consisted of cellular structures in bottom of the NiB₄C coating and dendritic ysolid solution plus the eutectic structure between the dendrites in the middle and top of the NiB4C coating. Constituent phases of the NiB4C coating mainly have y - Ni,y - (Ni, Fe) , (Cr,Fe)7C3, CrB, Ni₃B, Fe₂B and Fe₂₃(C, B)6. B₄C Ceramics Particles exist between the dendrites and not totally melted. Micro - hardness and sliding wear resistance of NiB4C coating are higher than that of the Ni60 coating. The strengthen mechanism of the NiB₄C coatings is analyzed.