China’s Qianlong Emperor commissions the largest library in imperial history

Story: 1772 C.E.  |  Last updated: January 1, 1772

In 1772 C.E., an imperial decree went out across China: gather the books. Every province, every private collection, every rare volume held by scholars and local officials was to be catalogued and sent to Beijing. What followed was one of the most ambitious acts of knowledge preservation in human history — the creation of the Siku Quanshu, the Complete Library of the Four Treasuries.

Key facts

• Siku Quanshu: Commissioned in 1772 C.E. and completed in 1782 C.E., the encyclopedia comprises 36,381 volumes, roughly 2.3 million pages, and approximately 997 million words — the largest collection of books in imperial Chinese history.
• Editorial board: More than 361 scholars served as editors, led by chief editors Ji Yun and Lu Xixiong, with around 3,826 scribes copying every word by hand over a decade of work.
• Four Treasuries: The library’s name refers to its four structural divisions — Classics, History, Philosophy, and Belles-lettres — covering texts from the Zhou dynasty’s I Ching through works of the Qing era itself.

An empire reads itself

The Qianlong Emperor’s commission was not simply about collecting books. It was about defining what Chinese civilization knew, valued, and remembered.

Local and provincial officers fanned out across the empire to locate important works. Private collectors were encouraged to submit rare volumes to the capital. At first, the response was cautious — China’s Literary Inquisition had made scholars wary of official scrutiny. But late in 1772 C.E., the emperor issued a reassuring decree: books would be returned to their owners, and owners would not be punished if their texts contained sentiment critical of the Qing. Within three months, four to five thousand books poured in.

By March 1773 C.E., an editorial board of hundreds had assembled in Beijing. The 3,826 scribes who copied the encyclopedia were not paid in cash. Instead, each received a government post after transcribing a set number of sections — an arrangement that tied intellectual labor directly to social advancement.

The scale of what was built

When completed in 1782 C.E., seven full copies of the Siku Quanshu existed. The first four were kept in specially constructed libraries in the north — in the Forbidden City, the Old Summer Palace, Shenyang, and Chengde. Three more went south, to Hangzhou, Zhenjiang, and Yangzhou.

Each copy ran to more than 79,000 manuscript rolls. The annotated catalogue alone — the Siku Quanshu Zongmu Tiyao, completed by 1782 C.E. and published in 1793 C.E. — described not only the 3,593 titles included in the full library but also nearly 6,793 additional works that were noted but not reproduced. That catalogue became the largest Chinese book catalog of its era.

The project surpassed the Yongle Encyclopedia of 1403 C.E., which had itself been the largest such compilation in Chinese history. In scope, the Siku Quanshu had no parallel anywhere in the world at the time of its completion.

Lasting impact

The Siku Quanshu became the authoritative reference for Chinese classical learning for generations. Its four-category structure — Classics, History, Philosophy, Belles-lettres — shaped how scholars, librarians, and educators organized knowledge in China well into the modern era.

The annotated descriptive notes written for each included work, detailing authorship, argument, and historical context, established a model of bibliographic scholarship that influenced Chinese literary criticism and cataloguing practice. These short annotations, placed at the front of the Complete Catalogue, are still referenced by researchers today.

The encyclopedia also preserved texts that might otherwise have been lost. It drew on centuries of Chinese printing and manuscript culture, consolidating knowledge across philosophy, medicine, astronomy, history, and poetry into one structured whole. Four surviving copies are held today at the National Library of China in Beijing, the National Palace Museum in Taipei, the Gansu Provincial Library in Lanzhou, and the Zhejiang Library in Hangzhou.

Blindspots and limits

The Siku Quanshu was also an act of censorship. Alongside the library, the Qianlong Emperor oversaw the Siku Jinshu — a catalogue of more than 2,855 books that were rejected and banned, the majority written during the late Ming dynasty and containing sentiment critical of the Manchu-led Qing. An additional four to five hundred works were edited or censored outright.

The emperor’s own political views shaped what was included and how texts were framed. Works touching on rival rulers or anti-Qing themes were scrutinized or suppressed, and some scholars doubt whether he honored his promise to return submitted books to their owners. The library that preserved so much also, by design, excluded and silenced a great deal — a tension that scholars of Chinese intellectual history continue to examine.

It is also worth noting that the scribes, editors, and collators who made the Siku Quanshu possible remain largely anonymous in the historical record. Hundreds of named scholars appear in official accounts, but the labor of the thousands of copyists who spent years reproducing every character by hand is rarely centered in the story of the project’s achievement.

Three of the original seven copies were destroyed — two completely, during the Taiping Rebellion and the Second Opium War — and the remaining four suffered damage during the Second Sino-Japanese War. What survives is extraordinary. What was lost is a reminder of how fragile even the most monumental acts of preservation can be.

Read more

For more on this story, see: Wikipedia — Siku Quanshu

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