Ren, as the core concept of Confucianism, is equivalent to Confucianism itself. It first appeared as a moral concept in Confucianism, but through the discussions of Confucian scholars through the ages, it has become a basic category with rich connotations that can be used to refer to the nature of human beings, moral norms, moral behaviors, and spiritual realm. On the basis of the work of constructing the ontology of modern Confucianism, Mr. Chen Lai, in his book The Ontology of Ren, reconstructed and interpreted the Ren theory of Confucian scholars through the ages. He developed the ontological and cosmological connotations of Ren from Ren of one and Ren of endless live, and regarded Ren as the cosmic essence, so that Renti was gradually revealed and finally proved. This theoretical innovation thoroughly philosophizes the Confucian idea of Ren and constructs a metaphysical system of it, which truly transcends the philosophical construction work of modern Neo-Confucianism, thus becoming a landmark achievement in the contemporary interpretation of Confucianism and the philosophical construction of contemporary China.