Coaxial powder feeding laser cladding of the Ni60A-B4C-TiN-CeO2 mixed powders on an aviation material TA15-2 titanium alloy substrate can form a hard wear resistance composite coating. Such coating is investigated by means of a scanning electron microscope (SEM) and a high resolution transmission electron microscope (HRTEM). Experimental results indicate that a large amount of nanocrystals-amorphous phases are produced in such composite coating. The nanocrystalline/amorphous interface owns a high bonding energy, which retards the growth of the nanocrystals in a certain extent; and the production of the nanocrystals lead the enhancement of free energy on the crystal boundary, which increases the density of point defect, causing the lattice distortions of the coating. Amorphous, nanocrystals and the other crystalline phases coexist in such coating. Such coating exhibits a better wear resistance than that of a TA15-2 substrate, and the main wear mechanisms of the coating are abrasive grain wear and the adhere wear.