Through a sample of 410 undergraduates who have disability or fighting behavior, this study explores the moderating effect of moral motivation on the relationship between moral judgment and antisocial behavior on the basis of a questionnaire survey. The findings show that: 1)antisocial behavior, moral judgment and moral motivation of undergraduates relate significantly to each other; antisocial behavior is positively and significantly correlated with personal interests, and negatively and significantly correlated with maintaining norms, post-conventional schema, citizenship, unselfishness and ethical identity; 2) the predictive power of moral judgment is higher than moral motivation in prediction of antisocial behavior of undergraduates, with personal interests as the body composition in predicting antisocial behavior; 3)the moderating effect of moral motivation on the relationship between moral judgment and antisocial behavior is the part effect. Basing on the findings, some suggestions on preventing antisocial behavior of undergraduates are proposed.