In order to study the mixed lubrication characteristics in the working zone of aluminium cold rolling,based on the average flow theory,a mixed lubrication model was set up for the aluminum cold rolling work zone in which surface roughness was taken into consideration,and the correctness of this model was verified by data from related literature.The lubrication characteristics of the whole working area was analyzed under the conditions of different rolling speed,viscosity,front tension stress and post tension stress,and the effects of rolling process parameters on oil film thickness,contact area ratio and stress distribution were studied.The results show that as the rolling speed increases,the rolling pressure will decrease to a certain extent,the contact area ratio will decrease and the oil film thickness will increase.The lubricant with higher viscosity can effectively reduce the rolling interface friction and rolling force.The greater the lubricant viscosity,the greater the oil film pressure.The effect of the front and post tension stress on interface friction is no significant and only the rolling force on the corrsponding side is reduced.