NgoThi Nham was a prominent historical figure of Viet Nam in the eighteenth century. Like many other contemporary confucians, Ngo Thi Nham was interested in some of the political issues of the society and he considered those his basic thought and treatment. Within the article, the author wants to specify the concept of Ngo Thi Nham about the ontology, an old problem in the history of philosophy, which was acknowledged as the "balance of three religions", the thought was clearly about the concept of Ly and Tong confucian and Truc Lam Tam To, Ngo Thi Nham regarded the nature of the world as Tai Chi. Yin and Yang, Religion and Nothing. In addition, Ngo Thi Nham supposed that the existence of the world was infinite, timeless and unified in diversity. Although he did not pass beyond the objective idealist stance of "Ly hoc Tong Nho", he had launched a new perspective on the three religions based on the Confucian stance.