In 475 BC, China entered the Warring States Period. From this year to 22 1 BC, Ying Zheng, king of Qin, unified the whole country for 254 years.

During the Warring States period, wars broke out everywhere among vassal states. There are seven relatively large vassal states, namely Qin, Wei, Han, Zhao, Chu, Yan and Qi, which are called "Seven Heroes of the Warring States". Among these seven countries, Qin and Chu are the most powerful.

Qin and Chu often compete for the hegemony of the world. At that time, in order to survive better, some small countries sometimes worked for Qin and sometimes moved closer to Chu, and they didn't know which country they were loyal to. So do many lobbyists, sometimes giving advice to the State of Qin and sometimes to the State of Chu. Chao, a gifted scholar in the Northern Song Dynasty, summarized this phenomenon as "de-Qin Hua".