Free lipase-mediated biodiesel production has been considered as a promising way due to its advantages of high catalytic efficiency and lower preparation cost.Exploring the feasibility of free lipase to convert potential low quality oil feedstock into biodiesel is of great significance for further reducing the cost of biodiesel production.However,it is reported that low quality oils usually contain a high concentration of phospholipids.Our previous study showed the presence of high phospholipids content in oil feedstock would lead to a poor catalytic performance of free lipase NS81006.