Abstract: Ideological and political education has undoubtedly made some achievements in improving people’s quality. But there still have some practical problems of poor validity. There are many reasons for this result. The most serious thing is to make the “perfection” on needs by banning personal interests as a specific and real standard. In fact, personal interests, as the basis of survival and development, can not be banned completely. So, interests are the basis of morality, the “correct understanding of interests principle” is a perspective of solving the poor validity problem in ideological and political education. But the “correct understanding of interests principle”, itself, is defective. There are contradictions and conflicts between the principle and the pursuit of ideological and political education. Therefore, we have to regulate the principle to promote the “correct understanding of interests principle” which combines a kind of rational “limited self-interest” with “perfect ideal”.