the synthesis of which must avoid using the toxic catalysts or initiators and the organic solvents. Ring-opening polymerization is a method of high efficiency and mild condition. The mechanism of ring-opening polymerization combined with green preparation technology is a hot issue on the research of aliphatic polyester medical materials. The method of ring-opening polymerization of aliphatic polyester and the role of catalysts and initiators used in the polymerization were introduced. The development of replacing organometallic initiators with non-metallic and lipase was summarized. The green synthesis technology used the supercritical fluid as solvent and the advantages of supercritical fluid technology were introduced. Finally
the development and application prospect of aliphatic polyester were briefly forecasted.