Abstract: The metal element contents of K,Ca,Na,Zn,Cu and Mn were determined,total flavonoids were extracted from Cirsium japonicum with ultrasonic method,and the antioxidant activities were researched.The results showed that: (1) the root contains Na,Ca and Mn three metallic elements with 4172.0041mg/kg Ca and 8522.2762mg/kg Na respectively; the aerial part of Cirsium japonicum contains Na,Ca,Mn and Zn four metallic elements with 7390.7273 mg/kg Ca and 9177.5275 mg/kg Na.(2) The contents of total flavonoids from extraction of 50%,75% and 100% ethanol are 6.615mg/g,12.120 mg/g and 3.030mg/g,that of aerial part are 8.190mg/g,14.940mg/g and 10.230mg/g.The total flavonoids in Cirsium japonicum from aerial part had certain antioxidant activity.

Key words: Cirsium japonicum, metallic element, aerial part, total flavonoids, performance