The ancient books in China are divided into four parts, namely "the subset of classics and history". The names and order of these four parts are finally determined in the Annals of Classics and Records of Sui Shu. The specific division of labor is as follows:

Ministry of classics: refers to Confucianism. At the beginning of Confucianism, there were five classics, namely, poetry, calligraphy, Yi, etiquette and Spring and Autumn Period, which were collectively called "Five Classics". From the Tang Dynasty to the Song Dynasty, thirteen classics were formed, namely the Book of Changes, Shu, Shi, Zhou Li, Li, Li Ji, Zuo Zhuan, Gong Yang Zhuan, Gu Liang Zhuan, The Analects of Confucius, Xiao Jing, Er Ya and Mencius.

History Department: refers to a history book that records the rise and fall of history, the suppression of chaos, various people and the evolution of the system. As early as 4,000 years ago, China had a historical record. All kinds of historical works fall into this category. Sima Qian's Historical Records is the beginning of the official history of China. Since then, almost every dynasty has a history, and * * has 24 histories. In addition, there are ancient history, unofficial history, codes, local chronicles, official positions, political books, seasons and so on. All recordable books are included in the history department.

Subdivision: refers to books that record the contention of a hundred schools of thought and their theories. During the Spring and Autumn Period and the Warring States Period, scholars came forth in large numbers and a hundred schools of thought contended. Philosophy, honorary science, law, medicine, mathematics, military science, astronomy and agriculture are all very developed. Each family writes a book, and later generations become a family because they are second only to Confucian classics, so they are called sub-books. Taoism, Neo-Confucianism in Song and Ming Dynasties and Textual Research in Qing Dynasty were also included in the Ministry.

Anthology: The collection of essays, parallel prose, poems, words, songs and other literary criticism works by writers of past dynasties all belong to this category. What belongs to one person is called another collection, several people's works are called a collection, and poetry collections are called poetry collections.

The name "Four Treasures of the Study" originated in the early Tang Dynasty. The official collection in the early Tang Dynasty was divided into four stacks of classics and history, which were called "Four Treasures of the Study" or "Four Treasures of the Study". The quartering of the subset of classics and history is the main method of ancient book classification, which basically covers all ancient books, so it is called "the whole book".

Classics: University, Doctrine of the Mean, The Analects of Confucius, Mencius, The Book of Songs, Shangshu, Yili, Zhouyi, Zuozhuan in the Spring and Autumn Period, Erya and Xiaojing.

History: Classic of Mountains and Seas, Biography of Mu, Mandarin, Warring States Policy, Historical Records, Zhu, Luoyang Ji, Zhenguan dignitaries, Shi Tong, Literature and History.

Zi: Laozi, Zhuangzi, Gongsun, Han Feizi, Huai Nanzi, Liezi, Mozi, Xunzi, Sun Tzu's Art of War, Lu Chunqiu, Yin Wenzi, New Books, Fa Yan, Gui Guzi, Yan Jiaxun, Jiu Zhang Arithmetic, Jin Si Lu, Jing, Zhouyi Shentongqi, Huangdi Neijing and Huangdi Waijing.

Collection: Songs of the South, Literary Deeds of the Six Dynasties, 300 Tang Poems, Wonderful Poems, A View of Ancient Chinese Literature, Wen Xin Diao Long, Poetry, Twenty-four Poems, Poems on June 1, Poems on the World, The West Chamber, Dou E Yuan and Peony Pavilion.