Laser cladding is the one of the efficient methods for the surface hardening and modifying of metal material. Using this technology, NbC particulate reinforced Ni-based composite coating has been successfully in situ synthesized on steel A3 substrate by prior to pasting. The microstructure observation and hardness test on the cross-section of the laser clad layer were performed. And that X-ray diffraction (XRD) analysis and tribotesting on the surface of the coatings were also accomplished. The microstructural and metallographic analyses by a scanning electron microscope (SEM), energy-dispersive spectrometer (EDS) and X-ray diffractometer reveal that the coating epitaxial growing from the substrate with excellent bonding between the coating and substrate is ensured by the strong metallurgical interface and suggest the presence of the in situ synthesized NbC particles in the clad layer. These NbC particles together with the carbide dendrites present as reinforcements of the composite coatings and are homogenously dispread in the γ(Ni Fe) matrix. The experimental results show that the composite coating gives high average hardness of HV0.31200 and excellent wear resistance, which is 2.5 times as high as that of pure Ni60 coatings. The improvement of wear resistance is due to the presence of the substantive in situ synthesized NbC particles and their homogenous distribution in the coatings.