The contents of total phenols and total flavonoids of stem and leaf ethanol extracts from Angelica keiskei Koidzmi was determined.Taken Rutin as the positive control,total antioxidant capacity,iron ion reduction / antioxidant capacity were investigated,the scavenging capability against superoxide anion free radicals,hydroxyl free radicals and DPPH free radicals were determined.The different antioxidant activities between stem ethanol extracts and leaf ethanol extracts were evaluated.Results indicated that total phenols and total flavonoids in leaves ethanol extracts were respectively 2.2 folds and 5.2 folds of stem ethanol extracts.Under the same conditions,the concentration of total flavonoids,antioxidant activities of the ethanol extracts of leaves and stems were positive correlated with the mass concentration of total flavonoids.The antioxidant activities of leaves ethanol extracts were significantly higher than stem ethanol extracts.Compared with rutin,scavenging capability of rutin against hydroxyl free radicals were greater than leaves ethanol extracts,but other antioxidation activities of rutin were lower than the leaves ethanol extracts and higher than the stem ethanol extracts.Results showed that leaf ethanol extracts from Angelica keiskei Koidzmi can be used as a natural antioxidant for development and utilization in the future.