Zhao Gao started as a eunuch, relying on the favor of Qin Ershi and Hu Hai, and pushed the tyrannical politics of the Qin Dynasty to the peak, thus accelerating its demise. Therefore, Lu Jia sighed: "The criminal law of Qin people will remain unchanged, and Zhao will be destroyed (referring to the demise of the Qin Dynasty)", while Liu Xiang, editor of Warring States Policy, even bluntly said: "The surname (that is, imperial clan, here referring to Zhao Gao) is king, and it is not easy for him to share the same surname, but he will die. Therefore, the king's rule over the world lies in the law, not in the belief in the same surname. "
In addition, Zhao Gao was also a great calligrapher in Qin and Han Dynasties. In Xu Shen's Preface to Explaining Words in the Eastern Han Dynasty, it was said: "Zhao Gao wrote a calendar chapter, took the seal of history, or kept it quite." There are 59 calligraphers in Wang Qing's Annals of Ancient and Modern Characters, including Zhao Gao. In the Southern Song Dynasty, Yang Xin called Zhao Gao a "good seal character" in "The Name of Ancient Books". Zhang Tang Huai Guan's Shu Duan was published in Da Zhuan: "Zhao Gao is good at seal cutting. Teach Hu Hai, the youngest son of the emperor. " He is the author of six chapters.