Abstract: The tribological properties of WS₂ film/ perfluoropolyether (815Z) and WS₂/ poly-α-olefin substituted cyclopentane (P201) composite lubrication systems were investigated by a vacuum ball-on-disk tribometer. The morphology, element composition and chemical state of the worn surfaces were examined by scanning electron microscopy, Micro-XAM 3D profilometer, energy dispersive spectrometry and X-ray photoelectron spectroscopy. The friction and wear mechanisms of the composite systems were also studied. It can be found that P201 showed the synergistic effect with the WS₂ film, comparing with the poor compatibility of 815Z with the WS₂ film. As a result, WS₂/815Z lubrication system exhibited fluctuant friction coefficient and high wear rate,while WS₂/P201 lubrication system had steady and low friction coefficient, and long lubrication life.