The Jin, Southern and Northern Dynasties lasted for more than 300 years. In this period of China's history, it is divided and combined, and it is combined and divided. It was this political situation that promoted the continuous development of China society in this period. In 280 AD, Sima Yan, Emperor Wu of Jin Dynasty, conquered Wu and established the Western Jin Dynasty. After a long period of division, the whole country was reunified, and the Jin Dynasty implemented the policy of suppressing Wu and Wen, which caused devastating damage to national defense and eventually led to the "Eight Kings Rebellion" and the collapse of the Western Jin Dynasty. Then there was a long-term confrontation between the Northern and Southern Dynasties, and finally the Sui Dynasty unified the whole country, which lasted for more than 300 years.