In order to study the effect of oil-air lubrication on sliding friction element, the experiments between oil-air lubrication and oil lubrication have been done by using friction-abrasion testing machine. By means of measuring the temperature rise, the friction coefficient of two different lubrication systems in the same conditions and studying the temperature rise and the friction coefficient of oil-air lubrication with different oil flow rate at the same load and rotating speed level, the results obtained show that when the oil flow rate of oil- air lubrication is equal to 10ml/h, the temperature rise of the element is the same as submerged lubrication caused. As the effect of oil aeration, the friction coefficient of oil-air lubrication is higher. When the load and rotating speed is at 1500N, 210rpm level, as the oil flow rate increases, the temperature rise and friction coefficient of oil-air lubrication element decreases significantly, however, they remain almost unchanged with the increasing of oil supply while the oil flow rate is increased to 15ml/h.