The essay is an attempt to investigate the logical relation among the main concepts of the philosophy of Wang Yang Ming (王陽明). Wang had established those new concepts such as "Mind is Moral" (心即理), "The Moral Law of Conscience" (良知之天理), and "Virtues Knowing and Moral Practice are Identical" (知行合一) as the fundamental propositions of the whole system. Efforts have been made to see how Wang extended the philosophy of Confucianism in the Ming Dynasty.