[Objective]Taking Dioscorea fordii Prain et Burkill as material,the antioxidant activities of its aqueous extracts were studied.[Method]Using the scavenging rate of superoxide anion and hydroxyl radical as indices,the single factor and orthogonal experimental design were employed to optimize the extracting technology for Dioscorea fordii Prain et Burkill by hot water.[Result]The optimum conditions was 70℃,an liquid-to-solid ratio of 60 ∶ 1,160 min.The scavenging rate of superoxide anion and hydroxyl radical...