Abstract: PBS/starch composite has a good performance in biodegradable characteristic. However, the poor interface compatibility results in poor mechanical properties. In recent researches, several methods are used to ameliorate the interface compatibility, such as the use of different type of plasticizer, coupling agent, or polyester-grafted starch. Modified starch nano-crystal is also added into PBS to improve its mechanical properties. The prospect of PBS/starch composite material is also pointed out.