Abstract: There is a unique category system in Chinese aesthetics.Being a knowledge structure which is unique for Chinese culture and is related to aesthetics,it is a logic network with four dynamic dimensions.It includes the following contents.(A) One logical starting point,i.e.,Wuji(the non-Ultimate).(B) A double philosophical ontology,i.e.,the essential Wuji of absolute none,and it combines with a secondary Taiji(the Great Ultimate) of relative none,by Wuji as “firstly ontology” and Taiji as “secondary ontology”.(C) There are three humanistic mainstays,namely,the “Dao”(the Way) of historical-philosophical significance,the “Qi”(the Vitality) of cultural significance,and the “Xiang” (the Image) of aesthetic and phenomenological significance,and they are the three-in-one.(D) So it is a fundamental structure of category groups respectively governed by Dao(the Way)-Qi(the Vitality)-Xiang(the Image) as well as their merge.The categorical system of Chinese aesthetics has the characteristic of orderly and deeply thinking-in-poetics and poetics-in-thinking,full of life consciousness which is unique in Chinese culture.