In The Theory of Yue Qin, it is concluded that Qin Shihuang sent Meng Tian to attack the Xiongnu in the north: Meng Tian built the Great Wall in the north and guarded the fence, but the Xiongnu was more than 700 miles; The conference semifinals dare not go south to herd horses, and the scholars dare not bow to their knees. Qin Shihuang then ordered Meng Tian to build the Great Wall in the north and guard the border, so that the Huns retreated more than 700 miles. Hu people dare not go south to graze, and warriors dare not draw bows and shoot arrows for revenge.

On Guo Qin is the representative work of Jia Yizheng's thesis, which is divided into three parts. The full text analyzes the faults of the Qin Dynasty from various aspects, so it is named "On Qin". This paper aims to summarize the historical lessons of Qin's sudden death and provide reference for the establishment of the system and the consolidation of the rule in the Han Dynasty. It is a group of articles with profound insights and great artistic appeal.

Extended data:

The first part of "On Qin" first tells the reasons why Qin Zi was filial to the masses and the emperor gradually became powerful: geographical advantages, the idea of reforming the country, the correct war strategy, and the painstaking efforts of several Qin kings.

Parallel prose and fine description methods are used in writing, which is full of momentum; After that, I wrote that although my strength is very small, I can bring down the powerful state of Qin. By contrast, I came to the conclusion that Qin's death was a "benevolent move".

The novella analyzes that after Qin unified the world, without correct policies, Qin Ershi failed to correct the wrong policies of Qin Shihuang, mainly accusing Qin Ershi of his fault. The next chapter writes that Zi Ying, the king of Qin, failed to save the country and help the poor, mainly accusing Zi Ying, the king of Qin, of his fault.