Taisu

The Taisu (), or Grand Basis, compiled by Yang Shangshan (), is one of four known versions of the Huangdi Neijing (''Yellow Emperor's Inner Canon), the other three being the Suwen, the Lingshu, and the partially extant Mingtang'' ( "Hall of Light").

==Time of compilation== On the basis of Yang Shangshan's official title at the time of compilation, Nathan Sivin argues that the Taisu was written in 656 or later, most likely under the reign of emperor Gaozong (mid-7th century) of the Tang dynasty, and that Yang compiled it from fragments of one or several post-Han versions of the Neijing.