Zhu Xi took the succession of Confucianism as his duty. The new theory of Mou Zongsan’s unique standard, based on the criterion of “Xin Ti and Xing Ti”, holds that Zhu Xi can’t fit the true spirit of Confucianism in three aspects: ontology, congfu theory and text. Firstly, Mou Zongsan criticizes Zhu Xi’s for seeking Li from the outside, according to his theory of “Ge Wu Qiong Li”, thinks that Zhu Xi’s moral ontology is only exists and the practical and dynamic nature of Li is lost. Second, Mou Zongsan condemning the theory of seeking Li from outside thinks that the heart can only realize what the things is, and it cannot know what the heart is, so the noumenon and morality of heart are lost. Finally, the text of Da Xue on which Zhu Xi’s theoretical interpretation is based deviates from Confucianism of“Four Books”, so that the theory is criticized as “Bie Zi Wei Zong”. In fact, Mou Zongsan's argument is greatly different from Zhu Xi's original intention. Zhu Xi's ideological focus is not based on Da Xue. The principle that Zhu Xi said is the two-sided principle of existence and activity. His work is that adversity and heterogeneous discipline and self-discipline complement each other. Mou Zongsan's “Bie Zi Wei Zong” theory should be examined and reflected on this basis.