Abstract:The active ingredient content，antioxidant activity and reducing ability of Pueraria lobate extract and its extract were determined.The antioxidant activity was represented by DPPH radical scavenging ability，hydroxyl radical scavenging ability and reducing ability，was used to compare the antioxidant activity of various extracts and extracts of Pueraria lobate.The IC50value and A0.7value of the activity experiment were calculated by multiple fittings in Origin software，Pearson correlation analysis was used to determine the correlation between the content of active ingredients and antioxidant activity.The final measurement results showed that the highest content in the 70% ethanol extract of Pueraria lobata was the total flavonoids，the content was 326.1 mg/g，and the highest total polysaccharide content in the water extract was 183.9 mg/g.The order of anti-oxidation activity of Pueraria lobata extract and its extract was：ethyl acetate phase>n-butanol phase>water phase.Ethyl acetate extract from Pueraria lobata 70% ethanol extract had the best antioxidant activity.