Abstract:The fresh samples of dandelion were divided into five different organs： root， stem， leaf， flower bud， and seed. The ethanol extract of each organ was obtained by the Soxhlet method with 95% ethanol solution. Then， the following aspects were investigated： the scavenging ability against DPPH free radical， as well as the content of polyphenols， polysaccharides， and flavonoids in the extract. The results showed that there was certain antioxidant activity in the ethanol extracts of each organ， in the descending order： seed＞leaf＞flower bud＞stem＞root. The order of polyphenol content was seed＞leaf＞flower bud＞stems＞root. The order of polysaccharide content was root＞stem＞seed＞leaf＞flower bud. The order of flavonoid content was leaf＞flower bud＞stem＞seed＞root. Finally， Pearson correlation analysis was conducted on the content of antioxidant active ingredients and IC50. The conclusion was that the antioxidant activity of dandelion extract in different organs was significantly positively correlated with the polyphenol contents in the organs.