Polymer banded spherulites have attracted intensive interest due to their intricate organization in the past half century.Understanding on banding mechanism of polymer spherulites is becoming deeper and deeper

thanks to the great efforts of the researchers.However

there are still some questions unsolved.In this article

an overview of the formation mechanism of polymer banded spherulites is outlined.We will focus on organization of lamellar crystals in the banded spherulites and the drive force for lamellar twisting. Banding mechanism of chiral polyhydroxyalkanoates is summarized.Finally

the remained questions are put forward for future research.