Early Western Han Dynasty,Liu BangWhile eradicating the vassal kings with different surnames, he also enfeoffed nine children of the Liu surname as kings, hoping to rely on the power of the Liu clan to serve as the wings of the imperial power. However, with the growth of vassal kings and the growth of local forces, their shortcomings and hidden dangers gradually emerged.

Emperor Wen was already prominentChao CuOHe was also keenly aware that the rise of the power of the princes would inevitably pose a serious threat to the central government of the Han Dynasty, so he proposed to Emperor Jing Liu Qi to "cut the vassal", that is, "cut the branches and counties", under the direct control of the central government. Emperor Jing adopted this suggestion and began to gradually reduce the fiefdoms of the kingdom.

King Wu, who had long been preparing for rebellionLiu biTaking the opportunity to contact Chu, Zhao, Jiaodong, Jiaoxi, Jinan, Zichuan and other six countries, they raised troops at the same time on January 17, 154 BC (the first day of the first month of the third year of the Yuan Dynasty of Emperor Jing of the Han Dynasty) and launched a rebellion in the name of killing Chao Cuo by "Qing Junbian". The Seven-Power Allied Forces claimed to be 500,000 and were aggressive. Emperor Jing sent Zhou Yafu as a captain and led his army to meet him. Zhou Yafu stationed troops and held firm, while sending light troops to cut off Wu's grain road. In less than three months, Wu, Chu and other five countries were swept down, and the kings were killed or committed suicide. From then on, Emperor Jing returned all the military and political power of the vassal kingdoms to the central government. Then a new decree was promulgated stating that "princes cannot govern their countries."