MoS2-based nanocomposite films have good tribological properties,but the poor electrical conductivity limits their application as lubricating materials under current carrying conditions.In order to improve the electrical conductivity of MoS2-based nanocomposite film,the MoS2/Ag nanocomposite films with two different Ag contents were fabricated using an unbalanced magnetron sputtering system,and their tribological properties against GCr15 steel ball under different current conditions were studied.The results show that the two kinds of MoS2/Ag films have a similar friction performance under current carrying,while the low-doped MoS2/Ag nanocomposite film exhibits superior wear resistance.This is due to the better mechanical properties of the low-doped MoS2/Ag nanocomposite film.When there is no current carrying,the oxide particles generated in the friction process of MoS2/Ag nanocomposite films increase wear and reduce lubrication,and the wear mechanism is mainly abrasive wear.When the current is less than 0.5 A,the current promotes the formation of the transfer film,which reduces the friction coefficient,but increases the wear rate,and the wear mechanism is mainly adhesive wear.When the current is higher than 0.5 A,the wear of the film is accelerated by arc ablation,and the wear mechanisms are mainly abrasive wear,adhesive wear and arc corrosion wear.