Abstract: NiCrAl alloy adhisive coating and TiN composite coating were in turn deposited by reactive plasma spraying on ZL104 alloy substrate. The phase composition, microstructure, bonding strength, micro-hardness and wear resistance of the coating were studied by X-ray diffraction, structure observation, hardness test and tensile and wear test, and the wear mechanism was also discussed. The results show that the composite coating consisted of TiN, TiN_0.3 and a small amount of TiO₂ phases, and its structure was dense with a few cavities and microcracks. The coating and ZL104 alloy was well bonded, and the bonding strength was 17.7 MPa. The average hardness of the TiN composite coating was 1 330 HV, which was about 22 times of the substrate; the wear mass loss of the TiN composite coating increased with the load, and was much smaller than that of the substrate. The wear mechanism of ZL104 alloy was micro-cutting abrasive wear and micro-fatigue wear, while that of the TiN composite coating was micro-cutting abrasive wear.