The preparations made of the volatile oil of Houttuynia cordata Thunb. are definite in treatment for respiratory diseases, digest system inflammatory diseases and so on. Flavonoids are another main kind of effective components in Houttuynia cordata Thunb.. On the base of supercritical CO2 extraction of volatile oil from Houttuynia cordata Thunb., extraction and purification of flavonoids in this medical plant were studied in this paper, on one hand to make full use of the medical plant and on the oth...