Extract rough flavonoid from pteridium aquilinum var. latiusculum by using 70% alcohol, and then obtain refined flavonoid by purifying the rough flavonoid with polyamide.

• 用70%25乙醇提取蕨菜黄酮类化合物,得到粗黄酮,经聚酰胺纯化,得到精制黄酮。