Series name. Compiled during the reign of emperor Qianlong of Qing dynasty. It started at 1772 and was compiled after ten years. The largest official book in ancient China is also the largest series in ancient China, which is divided into four parts: classics, history, books and collections, hence the name Siku. According to Wen Jin Ge Ji, this book contains 3,503 kinds of ancient books, 79,337 volumes (79,337 volumes), and more than 36,000 volumes are bound. A large number of documents have been preserved. The name "Four Treasures of the Study" originated in the early Tang Dynasty. In the early Tang Dynasty, the official books were divided into four stacks, namely "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". In the early years of Qianlong in Qing Dynasty, Zhou Shuinian, a scholar, put forward the theory of Confucianism and Tibet, and advocated collecting Confucian works for people to borrow. This theory has been widely responded by the society and is the social basis for compiling Sikuquanshu. The General Catalogue of Sikuquanshu is another important bibliography work.

Its branch is books.