First of all, Emperor Han Jing adopted Chao Cuo's policy of reducing vassals, which seriously harmed the interests of local governors. They dared not directly oppose Emperor Han Jingdi, but rebelled under the slogan of "Kill Chao Cuo Qing Jun". In order to consolidate his imperial power, Emperor Gaozu Liu Bang killed Wang with a different surname, wantonly enfeoffed the Liu clan with the same surname as Wang, and gave many privileges to local governors. By the time of Emperor Jing of Han Dynasty, the influence of local governors was very strong, which gradually threatened the imperial power. As a teacher of Emperor Han Jing, Chao Cuo proposed many measures to reduce the status of vassals. Later, after the implementation of Emperor Jing of Han Dynasty, it caused dissatisfaction among local governors.
Secondly, in order to reduce the pressure brought by the Seven Kingdoms Rebellion on the imperial power, Han Jing finally reluctantly killed Chao Cuo, but the Seven Kingdoms Rebellion did not end there. Seeing that the influence of the seven kingdoms is growing, the threat to their imperial power is becoming more and more serious. In order to ease the contradiction between Han Jing and the seven countries, adopted a plan to kill Chao Cuo in exchange for the withdrawal of the seven countries, and finally killed Chao Cuo as planned. However, the seven countries that thought Emperor Han Jing was weak did not stop fighting. On the contrary, there is no martial arts to continue the crisis.
Finally, the Han army headed by Zhou Yafu put down the rebellion of the Seven Kingdoms, all seven kings died, and Sun's vassal states could no longer threaten imperial rule. After all, although the seven countries are allies, they also have their own ideas. Coupled with the slow news transmission at that time, the Han army, under the guidance of Zhou Yafu, carried out divide-and-conquer actions against them, and in just a few months, seven insurrection captaincy were put down. Except for Chu, the other six countries were abolished and handed over to the Han Dynasty. This also greatly increased the strength of the Han Dynasty, weakened the strength of local governors to a fragile point, and Emperor Han Jing also took the absolute initiative.