In the Eastern Han Dynasty, Cai Yong's calligraphy was able to seal the official seal. Li Shu, in particular, has the deepest attainments and the highest reputation, and has the evaluation of "Cai Yong's book is vigorous and refreshing".
In the fourth year of Emperor Xi of Han Ping, Cai Yong and other six classics were written in Zhengding. Cai Yong thinks that these classics have many mistakes and fallacies because of their attachment to vulgar Confucianism, so in order not to delay the later study, they are brought into play. After the imperial edict, Yong personally wrote Dan on the tablet, ordered the workers to engrave it, and stood outside imperial academy, with 46 tablets. These tablets are called Hongdu Shijing, also known as Xiping Shijing.