The antioxidant activity of four different solvent extr act s of Foeniculum vulgare Mill were determined by three different test systems,DPPH,ABTS and reducing power assay.The contents of total phenolics and total flavonoids of different extracts were also tested.The result shows that samples had different antioxidant ability;the antioxidant of methanol extract was significantly higher than those of the others.The main substances of antioxidant activities of F.vulgare Mill is phenolic compounds,and had no obvious correlation with the quantity of total flavonoids of extracts.