There are three important concepts in the book the Hanfeizi: Fa (法), Shu (術), and Shi (勢); these three concepts form the structure of the book. The goal of this thesis is to first make clear the concept of Shi (勢), and then discuss the relation of the concept of Shi (勢) to other important concepts in the Hanfeizi. After this discussion, I shall then clarify the political theory of Hanfeizi. In this thesis, there are four parts: firstly, an introduction of the background of Hanfeizi himself and his book, the Hanfeizi, and those who influenced him. Secondly, a comparison of Hanfeizi’s and Shenzi’s views about the concept of Shi (勢), and to investigate the similarities and differences between the two philosophers views of Shi (勢), then from the two philosophers viewpoints clarify the concept of Shi (勢). Thirdly, an account of the relation of the four concepts: Fa(法), Shu (術), Shi (勢) and Tao (道). Finally, I shall sum up the relation of the four concepts and compare them with the philosophy of law (or jurisprudence), and discuss to what extent the Hanfeizi still has value and function in the society of today.
Key words：Shi, Shu, Fa,Tao, The political purchase from the consanguinity, The political purchase from the law, A common ruler, Enlightened sovereign.