Gujin Tushu Jicheng

The Gujin Tushu Jicheng (simplified Chinese: 古今图书集成; traditional Chinese: 古今圖書集成; pinyin: Gǔjīn Túshū Jíchéng; literally "Complete Collection of Illustrations and Writings from the Earliest to Current Times"), Ku-chin t'u-shu chi-ch'eng (Wade-Giles), also known as the Imperial Encyclopaedia, is a vast encyclopaedic work written in China during the reigns of the Qing Dynasty emperors Kangxi and Yongzheng. It was begun in 1700 and completed in 1725. The work was headed initially by scholar Chen Menglei (陳夢雷), and later by Jiang Tingxi.

The encyclopaedia contained 10,000 volumes. Sixty-four imprints were made of the first edition, known as the Wu-ying Hall edition. The encyclopaedia consisted of 6 series, 32 divisions, and 6,117 sections. It contained 800,000 pages and over 100 million Chinese characters. Topics covered included natural phenomena, geography, history, literature and government. The work was printed in 1726 using copper movable type printing. It spanned around 10 thousand rolls (卷). About 60 copies were made.

The Emperor of China presented a set of the encyclopaedia in 5,000 fascicles to the China Society of London, which has deposited it on loan to Cambridge University Library.

One of Yongzheng's brothers patronised the project for a while, although Yongzheng contrived to give exclusive credit to his father Kangxi instead.