Abstract:The antioxidant activities of different polarities extracts from Toona sinensis seeds was studied.Toona sinensis seeds was extracted with 75%alcohol.Four extracts were obtained by using different polarities of solvents，such as petroleum ether，ethyl acetate，n-Butanol and water.The antioxidant activities of different polarities extracts from Toona sinensis seeds was compared by using total antioxidant activity and DPPH free radicals scavenge activity.UV method preliminarily estimated that different polarities extracts from Toona sinensis seeds contains functional groups and compound categories.Different polarities extracts from Toona sinensis seeds had some antioxidation activities，total antioxidant activity order：petroleum ether＞ethyl acetate＞n-butanol＞water；DPPH free radicals scavenge activity order：ethyl acetate＞water＞petroleum ether＞n-butanol.Linear relationship of petroleum ether and n-butanol were better.EC50 values were 0.490 7 mg/mL and 0.609 1 mg/mL；UV method showed that Toona sinensis seeds might contain anthraquinones，phenylpropanoids，lignans and coumarins et al.