Qin Huiwen 19 years old acceded to the throne as Qin Huiwen. With more complaints from the imperial clan, the imperial clan destroyed Shang Yang and did not abolish its laws. In 325 BC, he claimed to be the king of Qin and became the first king of Qin. During the political period, there were six countries in Lian Heng, namely, Zhang Yi, Gongsun Yan, Zixu, Sima Cuo, the Northern Expedition and Yi Qu, Xiping Bashu, Hangu in the east and Shang Yang in the south, which laid a solid foundation for the unification of China by Qin.

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When I was a prince, I once violated the ban. At that time, there were people who opposed the new law, and the law didn't work. Shang Yang said: "The reason why the law doesn't work is because of the interference of the nobles in the palace. If the monarch really wants to implement the rule of law, he must start with the prince. The prince can't punish him with ink, so he punishes his master with ink. " Since then, the law has been unimpeded, and the state of Qin has become better and better, but it has offended the prince.

When Qin Xiaogong died, the prince succeeded to the throne, and he was very unhappy at the thought of his punishment that year. In addition, at this time, Shang Yang's prestige was extremely high, and every household knew the law of Shang Jun. King Huiwen had scruples about Shang Yang, and a group of people such as Gongzi Qian took the opportunity to fabricate rumors about Shang Yang's rebellion. So King Huiwen took this opportunity to split Shang Yang, who had made great contributions to Qin, destroyed his home and consolidated his rights and status.

After consolidating his power, he inherited the legacy of filial piety and marched eastward to Wei. In the eighth year of Qin Hui (330 BC), the State of Qin ordered Gongsun Yan to break Wei Jun in Diaoyin (now south of Ganquan County, Shaanxi Province), and Wei enfeoffed Qin in Hexi.

In the year of Qin Jiu (329 BC), he attacked Wei and took Fenyang (now southwest of Wanrong County, Shanxi Province), Xishi (now Hejin County, Shanxi Province) and the suburbs (now southwest of Sanmenxia City, Henan Province). The following year, he attacked Wei and took Wei Puyang (now Xixian County, Shaanxi Province).

After several powerful offensives, Wei was forced to cede 15 county (now northeast Shaanxi) to Qin. From then on, Qin not only annexed all the territory west of the Yellow River of Wei, but also established an eastward position on the east bank of the Yellow River.

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