Social science. Li Zehou, The Course of Beauty, belongs to the social science type in the library. The Course of Beauty is a literary theory work created by Li Zehou, which was first published in 198 1. This book is an outline of the history of Chinese aesthetics. With profound and unique vision and vigorous and concise brushwork, the author covers the whole history of China's aesthetics. From the ancient dragon and phoenix dance totem to the Ming and Qing crafts, this paper describes the occurrence, formation and evolution of China's aesthetic consciousness from a macro perspective, and points out that this is also the accumulation process of national aesthetic consciousness characterized by practical rationality. This book outlines a general outline for the history of Chinese aesthetics. China Library Classification, referred to as Chinese Library Classification, is now the fifth edition. Including Marxism-Leninism, Mao Zedong Thought, philosophy, social science, natural science and comprehensive books, there are 22 basic categories. Book classification, also called book classification vocabulary, is classified according to the content, form, genre and reader's use. Under the guidance of certain philosophical thoughts, the books of various disciplines are divided into several categories according to their subject contents by using the principle of knowledge classification and logical methods. Each category is divided into many subcategories. Finally, every kind of book can be divided into certain categories, and each category has a category number. Classified thesaurus is a collection of hierarchical classification numbers and categories.