Four materials of cabbage that belonged to high-resistant,resistant,tolerant and susceptible were inoculated with black rot in this study.Such physiological and biochemical indexes as the activity of SOD and POD were tested.The relation between changes of SOD and POD and resistance to black rot was studied.The results showed that for resistant materials and susceptible materials,the activity of SOD and POD in seedlings showed an increasing trend with the prolonging of time.The activity change range of SOD and POD in ‘NO.014’ between inoculated materials and non-inoculated materials was higher than that of three other materials.The change range o ‘fQingfeng’ between inoculated materials and non-inoculated materials was the lowest.The change degree of enzyme in plants could reflect the resistance ability.Furthermore the ‘resistant’ materials had higher enzyme activity than the ‘Susceptible’ materials.