Abstract: Within the Confucianism，Mou Zongsan’s ideological system to determine Zhu Xi was “Bie zi wei zong”(a thought about neoConfucianism).He claimed that Zhu Xi’s moral ontology was “existence,no activities”,which was a deviation from Confucian development.Mou Zongsan’s determination on Zhu Xi had deepened the study of neoConfucianism;however,it also had cut off the coherence within Confucianism.

Key words: Mou Zongsan;Zhu Xi;“Bie zi wei zong&rdquo, (a thought about neoConfucianism)