To research the thought of Dong Zhongshu, one must not only consider him as a Dongzi in the intellectual tradition, but also consider him as Dongsheng in the classics tradition who studies and teaches Spring and Autumn Annals. Only if the relation of Dong Zhongshu and academic tradition in Pre-Qin is clear, Dong Zhongshu is clear. As a particular communication between Dong Zhongshu and Han Wu-ti, Three Suggestions of Heaven and Man embodies his ideals of politics and expresses his understanding of the whole teaching of the sage. This sage's whole teaching runs through heaven and man, as well involves sage ruler, gentleman, and common people. Therefore it is able to measure heaven mind, to prove human feelings, to refer to ancient story and to test present condition, so as to gain insight into the destiny and disposition and put the application of politics into the interrelation of heaven and man. In the question and answer with the Wu-ti, Dong Zhongshu also showed the grasp of the situation of the Han Dynasty and Han Wu-ti, so he was able to connect the teaching of the sage with the political reality of the Han Dynasty, and to connect observing Tao-shu with advising Han Wu-ti. To understand Dong Zhongshu not only makes us reflect on the misunderstanding of Dong Zhongshu himself, but also allows us to re-examine the ethos of traditional Chinese politics.