The thinking system of Yi Zhuan was completely derived from the thesis, ”Yin and Yang to make Tao, then everything based on it, ” this was deemed as a topic of ”combining The God and human beings into one; uniting objects and human together, ” and also integration between the nature and human. During the Pre-Chin Dynasty, all scholar groups, including the Confucianists, the Taoists and the Mohist, took the idea of the unity of the God and human as a mutual study target; they wanted to master this subject and connected it into their own theories on basis to build, carry out and gain as reference. ”Using human beings as the subject to understand principle of the God; using the God as the subject to aware of the existence of human beings”, the relationship between the God and people in Yi Zhuan; morality of ”the principle of all God created creatures can live forever and each is in his proper place was deemed as the philosophy of YI”; the epistemology of ”the integration of the subject (main part) and the object (non-main part); overall harmony of the nature and the society… In addition to trace the complementariness of the Confucianists and the Taoists, we can also make conclusions on all scholars' ideas in Pre-Chin period.