The regeneration of the waste lubricant oil is taken by molecular distillation with adjusted parameters.The performance of the regeneration oil is mainly decided by the determination of carbon residue,kinematic viscosity and acid number.Experimental results show that the value of carbon residue,kinematic viscosity and acid number all increase with the increasing temperature.For the comprehensive consideration,the temperature should be controlled at 180 ℃.It can also be found that the value shows a decline with the increasing pressure.As a conclusion,the pressure should be under 50 Pa.Compared with the waste lubricant oil,the regeneration oil which is obtained at 180 ℃,50 Pa,has ideal regeneration effect with ideal appearance,dereasing carbon residue and acid number.