本文即在於討論牟宗三先生提出的五峰、蕺山系的意義，與其用心之所在。首先，本文指出牟先先以為「五峰、蕺山系」的哲學意義，是在於能把握儒家主觀性原則與客觀性原則，也就是結合了《論語》、《孟子》強調道德主體性的心性論，以及《易經》、《中庸》的本體宇宙論，即是符合牟宗三先生的儒家道德形上學的規定。此外，本文也回應了對於「五峰、蕺山系」一些質疑。其中，蕺山思想較五峰所遭受的挑戰較大，但是不論質疑者把蕺山歸於「氣」，或者歸於一心的「合一觀」，皆無法否定蕺山思想是為重性天之尊的型態。最後，本文結論牟先生提出的五峰、蕺山系之型態，實即隱含了他的天人合一論在其中。

In this article, we discuss Mou Zong- San's viewpoint in the genealogy from Hu Hong (胡五峰) to Liu Jishan. First, Mou Zong- San holds that the system of Hu Hong and Liu Jishan's philosophy can combine the moral mind of subjection with Onto-cosmology of objection in Confucian philosophy. In short, the system of Hu Hong and Liu Jishan's philosophy can fit the judgement in Mou Zong-San's Moral metaphysical of Confucianism.Secondly, some questions about Mou Zong-San's viewpoint in the system of Hu Hong's and Liu Jishan's philosophy are answered. Liu Jishan's philosophy, which often encountered more challenges than Hu's, is his ”Chi-Only Theory” or ”Philosophy of Mind”. Whatever these opposite viewpoints are, we can't deny the importance of Human Nature and Heaven in Liu Jishan's philosophy.Finally, the conclusion of this article is that Mou Zong-San's thought of ”Unity of Heaven and Human Beings” is implied in the system of Hu Hong's and Liu Jishan's philosophy.