Intermetallic matrix composite (IMC) surface layer has been formed on Ni-based alloy surface by laser cladding via CO₂ laser. The Ni3Si composite coating of NbC particles reinforced was prepared by in situ contact reaction with preplaced powder mixtures of Ni-Si-Nb-C. It was found that compound material cladding coating mainly consists of NbC particles,Ni3Si intermetallic and Ni solid solution. An excellent bonding between the coating and the substrate was ensured by the strong metallurgical interface and good wettability between the reinforced NbC and the coating matrix. The NbC particles were about 2-4 μm in size and dispersed in the coating. The crystal structure of NbC and the growth kinetics of laser cladding play an important role in controlling the growth morphology of carbide.