Polyhydroxy fatty acid ester, an intracellular polyester synthesized by many microorganisms, is a natural macromolecular biomaterial. Because PHA has good biocompatibility, biodegradability and plastic thermal processing properties at the same time, it can also be used as biomedical materials and biodegradable packaging materials, so it has become the most active research hotspot in the field of biomaterials in recent years. PHA also has many high value-added properties such as nonlinear optics, piezoelectricity and gas separation.