Tongdian ?? is an encyclopedia compiled in the Tang Dynasty (618–907 CE) by the prominent scholar-official Du You ?? (735–812 CE). A survey of the social, political and cultural institutions of Chinese history, the Tongdian served as a longstanding model for the compilation of Chinese encyclopedias.
The Tongdian (Survey of Institutions) is an historical encyclopedia of two hundred chapters that was presented to the court in 801 by Du You (735–812