To improve the loadbearing capacity and humidity resistance of MoS2 lubricating coating,CuS-doped MoS2 composite coatings were prepared using magnetron sputtering,and the asgrown coatings were annealed in vacuum at 220,320 and 420 ℃,to release synergistic effects of CuS in MoS2 lubricant.The microstructure of the coating was observed by field emission scanning electron microscopy,the molecular structure of the coating was analyzed by laser Raman spectroscopy,the adhesion of the coating was qualitatively analyzed by Rockwell hardness test,and the lubrication properties of the coating were evaluated by friction and wear tester.The results show that with the increase of sputtering power of CuS target,the particles in the coating grow and the crystallization of CuS appears in the coating,and the bond strength of filmsubstrate is also decreased.After vacuum annealing,the surface of CuS-MoS2 coatings is decomposed,the thickness is decreased.The nucleation of MoS2(002) grows and tribological properties are improved.After annealing at 320 ℃,the coating gets the lowest average friction coefficient of only 0.08 at room temperature and RH70%,nanohardness is 5.64 GPa and has good wear resistance.This reveals that the changes of structure and composition of CuS-MoS2 coatings are beneficial to the synergistic lubrication effect of CuS and MoS2,which are due to the decomposition of CuS and the formation of microcrystalline phase.