Poetic is the one of the main content of the Chinese classical literary criticism. As a result of this paper, it is known that the argumentation of poetic has already begun consciously in the Wei Jin Southern and Northern Dynasties which was an era of independent literature. The content of the Wei Jin Southern and Northern Dynasties`` poetics was mainly a standard and principle being relevant to the element of the works and specific writing, and the discussion of the bad writing habits. In this Paper, We discussed on the each argument about the writing method, syntax, diction, parallelism, metres, allusion, metaphor and analogy, exaggeration etc. at that time. During this period, there were many poems who pursued the formal beauty and thought overmuch about the skill specially, but not many people left their argument about the poetic. Except for the special and complete argumentation of Liu Xie, Lu Ji and Zhong Rong, there were a lot of works which were short, simple and not comprehensive. However, it means a great development of the poetic with the poetical consciousness, and makes great influence to the following generations, especially for the Tang Dynasty. At the beginning of Chinese poetic, the argumentation of this period should be highly appreciated on its character and meaning.