After Wang Yangming died, different interpretations of his doctrine emerged, and thus the factionalization of the Yangming School of Mind also occurred. To Liu Zongzhou, who is considered the last master of Song-Ming NeoConfucianism, accompanied with this factionalization there came the degeneration of Wang Yangming's followers. In this study I discuss the following fi ve issues: fi rstly, Liu's sense of the degeneration of Wang Yangming's followers, secondly, the debate on Wang Yangming's "Four Sentences of Teaching," mainly the debate between Qian Dehong and Wang Ji, and the one between Xu Fuyuan and Zhou Rudeng, thirdly, Liu's criticism of Wang Yangming's "Four Sentences of Teaching" and the debates on it, fourthly, Liu's criticism of moral decay in the circle of Wang Yangming' followers, including Wang Ji, Wang Gen, Tao Shiling, and the scholars of Mount Baima, lastly, Liu's scheme for moral reformation, including his Renpu as a basic project and the founding of Zhengren huei. From the discussion of these fi ve issues I will elucidate how Liu, as a master of Neo-Confucianism, refl ected to the intellectual problems of his time, and his scheme for moral reformation related to the intellectual climate in the period from late Ming to early Qing.