The work aims to introduce the research progress of PLA, PGA and PLGA in packaging, to provide an outlook on the modified materials and preparation process, and to provide a reference for modification and preparation of PLA, PGA and PLGA. The preparation methods and basic properties of PLA, PGA and PLGA were introduced. The types of modified materials and their preparation processes in recent years were summarized. PLA, PGA and PLGA were modified, then the composite films were prepared with excellent UV resistance, barrier properties and antibacterial properties by solution casting and blown film making processes. PLA, PGA and PLGA have excellent biodegradable properties, and the films prepared by modification have more balanced properties, which have great prospects for application in packaging. In-depth research on polymer modification materials and methods is still needed to prepare composites with better performance.