First, the strength is superior
Zhao Gao's mother had violated the criminal law and was taken in by a hidden official set up by the Qin government to take care of the released prisoners. His father is probably also a junior judge, working in a secret office. He knows the law and is good at calligraphy. As an adult, Zhao became a master of calligraphy and became familiar with legal judgment, which may be due to family education.
There were 59 calligraphers in Qin, Han and Wu Dynasties, including Zhao Gao. When Qin unified the writing, Reese was ordered to write Seven Chapters of Cang Xie, Zhao Gao wrote Six Chapters of Mourning Calendar, and Lee Tae named Seven Chapters of Learning as the national standard copybook. It can be seen that Zhao Gao's attainments in calligraphy are still very high. Because he was diligent and proficient in law, he was promoted to the commander of CRRC Palace by Qin Shihuang. More importantly, Qin Shihuang asked him to teach his son Hu Hai calligraphy and criminal law. Zhao Gaoshan was good at reading and listening, and soon gained the appreciation of Hu Hai. Since then, Zhao Gao has a high-quality springboard.
Second, launch a coup.
In 2 10 BC (the thirty-seventh year of Qin Shihuang), Qin Shihuang died on the way back from his fifth tour in Duntai (now northwest of Guangzong, Hebei Province). Before Qin Shihuang died, Zhao Gao, who was in charge of the Emperor's mansion Xi, called the eldest son's mansion Su back to Xianyang to preside over the funeral and succeeded him as emperor. Zhao Gao was worried that Fu Su would be bad for him after he succeeded to the throne, but he always followed Hu Hai and won his appreciation. If Hu Hai succeeds to the throne, his career will be smooth sailing. So after the imperial edict was drafted, Zhao Gao promised the first emperor on the surface, but actually secretly detained the imperial edict, but it was not issued.
At that time, Zhao Gao quietly took the letters that had not been sent before and found Hu Hai, saying that he was in charge of the imperial edict. It's a piece of cake to redraw letters and persuade Hu Hai to succeed Fu Su. Hearing this, the Hu Hai has such a good thing? So I immediately hit it off with Zhao Gao.