Zhao Gao (? - 207 BC) was a famous eunuch and powerful official in the Qin Dynasty. Yang Xin of the Southern Dynasties recorded his good seal script in "Cai Gu Lai Able to Write People's Names". "Hanshu. Yiwenzhi" records that Zhao Gao once wrote six chapters of "Yuan Li Pian", and the text is mostly taken from "Shi Zhou Pian". The seal style is quite different, which made a certain contribution to the creation of Xiaozhuan. "Historical Records. The Sixth Annals of the First Emperor of Qin" records that "Zhao Gao once taught Hu Hai the book and prison laws and regulations, and Hu Hai was lucky enough to do so." There is no examination of the work.