The work aims to study friction and wear properties of Ti6Al4V alloy, chromium doped diamond-like carbon (Cr-DLC) films, tungsten doped diamond-like carbon (W-DLC) films and titanium nitride (TiN) films under the conditions of dry friction and salt spray corrosion friction. Cr-DLC films and W-DLC films were prepared on commercial Ti6Al4V alloy in the method of unbalanced magnetron sputtering. TiN films were prepared by adopting multi-arc ion plating technique. Morphology, hardness, dry friction performance, corrosion friction resistance and wear scar morphology of the films were tested and analyzed by using scanning electron microscope, microhardness tester, friction and wear tester as well as white light interference scanning profiler. Friction coefficient of Cr-DLC, W-DLC and TiN films deposited on the surface of Ti6Al4V alloy were lower than that of Ti6Al4V itself under dry friction condition. Compared with the condition under dry friction, the friction coefficient of Ti6Al4V and the three films prepared on its surface were increased in the salt spray corrosion atmosphere. Compared with wear volume of Ti6Al4V alloy, that of Cr-DLC, W-DLC and TiN films was reduced under the conditions of dry friction and salt spray corrosion. Under the dry friction condition, the wear volume of W-DLC film was 0.0017 mm3, and the film showed the best wear resistance. Under the salt spray corrosion condition, the wear volume of TiN film was 0.0028 mm3, and the film exhibited the best corrosive wear resistance. It could be concluded from wear scar morphology that the wear of metal-doped diamond-like carbon films prepared on the surface of Ti6Al4V alloy was affected by dual mechanism of abrasive wear and corrosion wear under the condition of salt spray corrosion. Ti alloy is well protected by the three kinds of surface functional films under the condition of salt spray corrosion friction, and wear loss is greatly reduced.