Shuzhi shu 書旨述

Shuzhi shu 書旨述, also written 書旨術, is a text on calligraphy written during the early Tang period 唐 (618-907) by Yu Shinan 虞世南 (558–638).

It presents a brief discussion on the origins, development, practical application, and evolution of various calligraphic styles. The essay, written in the format of a dialogue between the author and the "Master Penetrating the Obscurity" (Tongxuan Xiansheng 通玄先生), is coherent in its meaning and allows for a longitudinal perspective on the development and changes in calligraphy styles. The essay starts with a history of the Chinese script and its development through the ages, from the large seal script and the small seal script to the chancery and the standard script.

The Shuzhi shu is included in the series Lidai shufa lunwen xuan 歷代書法論文選.