Choose the capitulum of Chrysanthemum indicum L.as raw materials.The methods of 1-Diphenyl-2-pi-crylhydrazyl(DPPH),methylrosaniline chloride,pyrogallol autoxidation were used to assay the scavenging quality of DPPH.,hydroxyl free radical(.OH) and superoxide free radical(O2-.) and anti-lipid peroxidation of the water and 70% ethanol extract from the capitulum.The result showed that the different scavenging effect of water extract on DPPH.,.OH,O2-.and lipid peroxidation system under the condition of the exper...