Abstract: The potential hazards of pollution by used lube oils is generally showed up. The traditional way of used lube oils’regeneration p roduces numerous aciditymud, which can’t be compatible with the environment. We work out the new method to regenerate used lube oilswith membranes for seperation, chose the rightmembranes to regenerate the used lube oils. W ith p ressure membrane p rocesses to increase the permeability of the membranes, the permeability of the membranes increased obviously.