Abstract: Under the condition of minimal oil supply lubrication, the surface spreading oil transport becomes the key factor affecting the fluid lubrication state of bearing rolling element. In this paper, based on surface rough contact and oil wetting spreading, a flow equilibrium condition is developed, and a mathematical model is discussed for oil spreading elastohydrodynamic lubrication in point contact. Then, a numerical analysis is carried out to discuss the influence of surface roughness and load on the contact pressure and film thickness. The results show that, the phenomenon of starvation lubrication often occurs during the high-speed stage of lubrication. The rough contact bears the main load in cases of low speed and heavy load, while the hydrodynamic effect and film forming capacity are weak. Under the condition of oil spreading lubrication, the starvation lubrication often occurs at high speed, which leads to the decrease of film thickness and the increase of contact pressure. The engineering surface roughness oil transportation may form a full-film lubrication state, which can be used as a lubrication design method under special conditions such as micro-oil supply. Surface roughness significantly affects the oil spreading transport capacity. Through reasonable matching design of surface roughness, load and velocity, the full film lubrication may be obtained under high load conditions.