Subjects
- Classics 經 comprises the Thirteen Classics of Confucianism (十三經), commentaries on the classics, and philology.
- History 史 contains historical works and documents, as well as works in geography, epigraphy (金石學), historiography and bibliography.
- Masters 子 includes a wide range of subject areas, such as masters and hundred schools of thought (諸子百家) of the late Warring States (475-221 BC), agriculture, medicine, fine arts, astronomy, math, encyclopedias (類書), Buddhist and Daoist works, etc.
- Literature 集 primarily consists of literary works and anthologies, collected works of individual authors, and poems.