The anthocyanins of black bean seed coat were extracted by enzyme assisted method,and the process conditions were optimized and the antioxidant activity was evaluated.On the basis of single factor experiment and response surface methodology,the optimal extraction process of anthocyanins from black bean seed coat by enzymatic assisted was determined as follows:compound enzyme(cellulose contents 400 U/g,α-amylase contents 50 U/g),enzymolysis temperature 50 ℃,liquid-solid ratio 26∶1 mL/g,ethanol volume fraction 64%,enzymolysis time 59 min.Under these conditions,the content of anthocyanins was 2.019 mg/g.Antioxidant test showed that the reduction ability and superoxide anion radical scavenging ability of anthocyanins from black bean seed coat were lower than that of ascorbic acid,but the scavenging ability of anthocyanin to nitrite ion,DPPH radical and ABTS radical was stronger.Extraction by enzyme assisted is an efficient method to extract anthocyanins from black bean seed coat.As a new anthocyanin resource,anthocyanins from black bean seed coat have a certain research and application value.