|There has been many studies on Yan Yu`s Canglang Poetry Talks, this book is the most typical poetics criticism of Song Dynasty and also is in a strong position on The history of Chinese classical literary criticism until now. Previous research is concentrated in few points such as Analyzing Poetics Metaphorically with Chan(以禪?詩), Miaowu Theory(妙悟說) and Xingqu Theory(興趣說). That research was mainly based on < Poetic Differentiate(詩辨) >, and People didn`t pay much attention to it or simply put < Poetic(詩法) > briefly. One of the most important features of Song Dynasty`s prosody was the study of the poetics. Yan Yu was very strong on poetics, deliberately he arranged < Poetic > in Canglang Poetry Talks and specifically discussed in poetics. The content of < Poetic > is quite extensive. It is mentioned about some precautions for people who want to write and learn poetry, dealt with poetics to many ways as writing method(篇法), syntax(句法), diction(字法), quotation(用事), rhyme(押韻) etc. In addition it presented the main rules and principles of expressions. However, he opposed the poetics unconditionally and opposed it. Yan Yu considered that desirable poetry had must express `Interest` and proposed the poetics to express this `Interest` well. Since Wei Jin and southern and Northern Dynasties, through Tang dynasty, ranging from Song Dynasty, the Poetic Theory of Yan Yu`s Canglang Poetry Talks was comprehensive and organized the various arguments about poetics which is raised by many poetic theories.