This paper is a study of function and meaning of Rites(Li) in the Han Dynasty emperor ruling system. A thinker we will specifically deal with is Dong Zhong-Shu. Analysis on Dong Zhong-Shu‘s humanity is based on "enforcement" and "limitation" of kingship. Emperor receives legitimacy of ruling the world from the sky. He hopes to get legitimacy of Emperor wu of the Han Dynasty political power and asks Dong Zhong-Shu. It was the time of integration of ideas. Dong Zhong-Shu also followed this tendency. Dong Zhong-Shu delivered the result of a study on enforcing the emperor ruling system to Emperor wu of the Han Dynasty. Confucian Scholars have two positions on politics. One is to adapt and the other is to restraint current politics. I will make an analysis on both positions and criticize. The combination of two positions is also covered. This is the point of this study. There is one thing that you need to look carefully. It is Dong Zhong-Shu's ‘The theory of efficacy between the Heaven and a Man’. We will consider this with emperor ruling system and Rites which is very meaningful. Study on the next three things will follow. First, Dong Zhong-Shu's humanity. Second, the growth of Confucian Scholars and how they participate in politics. Third, 'union' of 'the Heaven' and ‘a Man.’