Abstract: To obtain the mutagenic material of cowpea, with ‘Zao-sheng-wang’ and ‘Zhanjiang 215’ as tested materials, the dry seeds of 2 cowpea varieties were radiated with 60Co-γ Ray. The fertility of M2 population of cowpea were counted and the variation extent of 7 agronomic characters were analyzed by correlation analysis and cluster analysis. The results showed that there were some albino seedlings, puny-maize seedlings and sterile plants of no pollen in the M2 population of cowpea. The coefficient variation of agronomic characters were in sequence of branch numbers> pod numbers > numbers of effective pedicel> first flowering node > maximum pod length> average pod length> flowering stage, which there was very significant positive correlation between the three former mentioned. Maximum pod length was very significantly correlated with average pod length. And flowering stage was very significantly correlated with first flowering node, but very significantly negative correlation with pod numbers. The cowpea ‘Zao-sheng-wang’ and ‘Zhanjiang 215’ in generation M2 were grouped into six groups, and the former character variation rate was 27.49%, the rate of the latter was 24.55%. 33 and 40 mutant was screened from the fertility of M2 population of 2 cowpea varieties. The branch number, pod numbers, numbers of effective pedicel as the key to traits and there were advantageous to get variation individuals. But pod numbers for screening of high yield materials was more important.