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Biodegradable polymers are extremely important parts of sustainable polymers, and their promotion and application can certainly address both environmental and energy issues. We devote to provide ideas for the modifications and preparations of biodegradable polymers like PLA and PBAT which are two emblematic biodegradable polymers. Performance modification of either PLA or PBAT can generally be achieved via chemical or physical methodologies, for example, copolymerization, esterification reaction, grafting, and simply blending processes. The PLA/PBAT blends or composites subjected to above modification are expected to show more wide applications in the areas of film and sheet package materials.