This paper investigated the present situation of undergraduates' moral governance ability by the method of questionnaire and explored the inner psychological mechanism and rules of undergraduates' moral governance ability through mediating effect model. The results show that: 1) The moral governance ability of undergraduates keeps a high level, and it will adjust subtly as the situation changes; 2) the moral governance ability of undergraduates has significant differences in gender and grade, girls are higher than boys in moral governance ability, and the moral governance ability of undergraduates shows a tendency of growth with the rise of grade; 3) moral sensitivity and moral disengagement have a concurrent and partial mediation effect in the influence of moral foundation on moral governance ability. Some advices and countermeasures of improving the moral governance ability of undergraduates are offered according to the conclusion.