In this book, the author adopts the methodology of "discussing philosophy by studying history of philosophy". The chapters in the book discuss the essential content of The Study of Renxue Ontology, Ren's development in pre-Qin (before 206BC) and Han period (206BC-220BC), Ren theories in Song Dynasty (960-1279) and Ming Dynasty (1368-1644). It covers topics ranging from Confucius and Mencius' classic theories to Li Zehou's ontology of emotions as well as the development of Ren in the historical context and its contemporary interpretations. The book develops the theory of Ren and Taoist style of classical Confucianism while critically incorporating modern Chinese philosophical ontology. The resulting philosophical construction incorporates classical Confucian Ren theory and the continuation of and responses to the arguments of modern Chinese philosophy, thus offering a comprehensive and innovative coverage of contemporary Chinese Confucianism. The book combines Chinese contemporary cultural heritage and creative development to promote contemporary Confucianism and harmony between China and the world.