Abstract: The microstructure and properties of Ag-TiN ceramic coatings were studied by DC magnetron sputtering at different power (60 W, 110 W and 150 W). Scanning electron microscopy, energy dispersive X-ray spectroscopy and X-ray diffraction were used to analyze the morphology and microstructure of the coating surface and cross section. The wear resistance of the coating was analyzed by reciprocating friction and wear tester. The results show that the coating thickness of the sample is 2.941 under three groups of power、3.625、5.023 μm. The weight percent of Ag on the surface is 50.97 wt%, 70.42 wt% and 91.25 wt%, and the main phases on the surface are Ag、TiN and TiO₂; With the power increases, the grain size of the coating decreases and the coating becomes more uniform and compact; Ag particles diffuse from the coating to the surface and act as lubricant, which reduces the friction coefficient of the ceramic coating. The friction coefficient of the sample decreases by 31% at 110 W sputtering power; In the wear test under 10 N and 20 N load, the wear loss of the coating surface is reduced by more than 33%, and the properties are increased by 41% and 31% times compared with the base material. The Ag-TiN coating can effectively improve the surface microstructure and wear resistance of titanium alloy. Comprehensive analysis shows that the microstructure of the coating prepared at 110 W sputtering power is good, the friction coefficient is low, and the wear resistance is the best.