Polylactic acid(PLA)is an excellent polymer material with good properties of biocompatibility and biodegradation,and is also approved as biomedical materials by Food and Drug Administration(FDA)of the United States.But its application in medical material is limited because of its hydrophobicity.In order to enhance its hydrophilicity,PLA has been modificated,for example PLA copolymerized with hydrophilic polymers to produce different types of amphiphilic copolymers.In this article,the research progress of am...