Algae biodiesel,as a kind o frenewable energy,has become a hot research topic,has wide application prospect and the characteristics of non-occupying-land,using a little water,high oil content and so on,and has many dozens of oil productivity per unit area than crops.This paper introduces research outline about microalgae biodiesel at home and abroad,analyzes the difficulties and problem in current microalgae biodiesel research and its application in insustrialization,and points out that the main challenge faced by present microalgae biodiesal researh is to reduce production cost.