Abstract: In the present study,the contents of flavonoids,total phenolic and antioxidant activities in different organs of Saussurea involucrata Kar.et Kir.were investigated.The flavonoids and total phenolic contents,ferric ion reducing antioxidant power and DPPH radical scavenging capacity of samples extracted from root,stem,leaf,blossom and bract of S.involucrate by by 80% ethanol were determined.The results showed:(1) the contents of flavonoids and total phenolic were:leaf> bract≈ blossom> root> stem;(2) the ferric ion reducing ability was leaf> bract> blossom> root> stem;(3) the DPPH radical scavenging capacity was leaf≈bract> blossom> root> stem.These data clearly demonstrated that the leaf of S.involucrate was the main part as field picking and medicinal usage.In addition,the bract of S.involucrate may contain other special strong antioxidants except flavonoids and phenols.

Key words: Saussurea involucrata, flavonoids, total phenolic, antioxidant activity