TiB-2/DLC nanomultilayer films were fabricated on silicon P(100) wafer and 304 stainless steel substrates by unbalanced magnetron sputtering system.The microstructure,surface and cross section morphologies were characterized by using Xray diffraction(XRD),atomic force microscopy(AFM),field emission scanning electron microscope(FESEM),transmission electron microscope(TEM),respectively.Vickers indentation,nanoindentation,friction tests were employed to investigate the effect of TiB2 target current on the mechanical and tribological properties.The results show that the TiB2/DLC multilayer film exhibits welldefined multilayer modulation structure,and the multilayers have a TiB2(101) preferred orientation.The surface roughness of the multilayers is increased with the TiB2 target current increasing.The hardness and toughness of the TiB2/DLC multilayer films are significantly improved,which is caused by the large content of heterogeneous interfaces.Harness of the multilayer film with TiB2 target current 20 A is twice higher than that of the monolayer DLC film.In the TiB2/DLC multilayers,the hard TiB2 layer shows superior carrying capacity,while the soft DLC layer plays a lubricating role in the friction process.Therefore,the TiB2/DLC multilayers show a lower friction coefficient compared with monolayer DLC film.