Abstract: In recent years,many studies have revealed the excellent anti-radiation effects of bio-flavonoids from various natural resources.The action mechanisms include the protections of hemopoietic and immune systems,the scavenging of active oxygen free radicals,the inhibition of lipid peroxidation as well as the prevention of DNA damage.In this paper,the research progress of flavonoids on anti-radiation and the action mechanisms were reviewed,especially focusing on their roles as natural radioprotectants.This review may be beneficial for developing bio-flavonoids as anti-radiation foods.

Key words: bio-flavonoids, radioprotectant, action mechanism, functional foods