The effective component flavon was extracted from 20 kinds of flowers by 80% ethanol.The antioxidant activities of the crude extracts of 20 flowers and their stability were also studied by flow injection chemiluminescence analysis.The results showed that all of the crude extracts of flowers had antioxidant activity and high stability.And the contents of the flavonoids from peony,canary-creeper and rose king were of 8.15mg/g,7.79mg/g,and 7.78mg/g respectively,which were higher than others.Besides,their inhib...