Sliding friction tests were performed on a MFT3000 multifunctional tribotester by ball disk model under oilair lubrication,and the test results were compared with those under dripping oil lubrication and dry friction.The surface morphology,chemical element composition and particle shape were characterized and analyzed by white light interferometer,scanning electron microscope (including EDS energy spectrum analysis) and iron spectrum analysis equipment.The results show that,under the condition of oilair lubrication,when the oil supply is insufficient,with the increase of oil supply,the friction coefficient,wear mass loss and wear scar parameters are decreased obviously,but the lubrication performance is worse than that of dripping oil lubrication.When the lubricating oil between the friction pairs is sufficient and the air supply speed reaches a certain value,the oilair lubrication can obtain a lower friction coefficient than the dripping oil lubrication,but the change of wear scar morphology is slight.At lower sliding speed and load,oxidation wear does not occur in point contact sliding friction test of oilair lubrication,and the cooling effect of oilair lubrication has no obvious effect on friction behavior,the wear mechanism is the same as that of dripping oil lubrication and dry friction,which are abrasive wear.The debris shape produced in the friction process is mainly fragment and flake,accompanied by a few long strips.