Moral rationality,a kind of moral thinking and judging capability belonging to moral subject,is the necessary condition of moral actions for moral subject.The significance of moral rationality to moral has been recognized by theorists of moral psychology and education home and abroad.Moral education should follow the law of somatopsychic development of human.The intellectual and moral development of college students determines that their moral education should be paid more attention to the cultivation of moral rationality.The cultivation in moral rationality capacity should follow the thinking logic of moral epistemology.Imparting the principle of moral value is the starting point of moral education for college students,and training moral reasoning and moral judgment is its sticking point.