A 2 kW CO2 laser was employed to clad a TiNp/Ni-alloy composite coating onsteel 1045.The microstructure and sliding wear property of the cladded layer were analyzed. The dilution of the TiNP-reinfored coating under different laser processingconditions was discussed. The cladded layer exhibits TiN particles,γ-Ni primary dendrites and the eutectics of γ-Ni+(Fe,Cr)23(CB)6 in the interdendritic regions. High density dislocations in γ-Ni primary dendrites and a large amounts of stacking-fault within (Fe,Cr)23(CB)6 phase are obseved. Partial dissolution appearing on the edges of original TiN particulates and their regrowth in the form of independent fine dendrites during resolidification are found in the cladding region. The addition of TiN particulates into Ni-alloy coating greatly improves the wear resistance of the composite coating by increasing the microhardness without distinctly increasing the friction coefficient of the composite coating.