? The Eastern Jin Dynasty (AD 3 17-420) and the Southern Dynasties (AD 420-589) are important periods for the development and evolution of China Southern Classics. The economy of the south has developed greatly, mainly from the establishment of the Eastern Jin Dynasty in the south of the Yangtze River to the Yuanjia period in Liu Song, which took about 150 years. Compared with the same period, northern China, full of turmoil and frequent wars, is a relatively peaceful and stable period. When analyzing the important reasons for the economic development of Jiangnan in the Eastern Jin Dynasty and the Southern Dynasties, we often provide a relatively stable environment for economic development from the stable political situation in the south; The northern population who moved into Jiangnan brought advanced production technology and technology to Jiangnan, and the influx of population also made up for the shortage of labor. Coupled with the mild and humid climate in the south, it is conducive to the growth of crops. Although these are undoubtedly important reasons for promoting the economic development in the south of the Yangtze River, we seem to have overlooked an important reason, that is, the role of social and political forces in economic development can not be ignored, which is the economic policy of the southern regime.

? First of all, the Eastern Jin Dynasty was partial to the south of the Yangtze River. Among them, the former Zhao, the latter Zhao, the former Yan, the former Qin and the latter Qin harassed the territory under the rule of the Eastern Jin Dynasty from time to time, and sometimes even suppressed the territory, posing a great threat to the Eastern Jin regime. To this end, the Eastern Jin regime carried out many northern expeditions, and sent Zu Ti, Pi Yi, Yin Hao, Huan Wen and later Liu Yu to carry out the northern expedition. These actions objectively recovered some areas south of the Yellow River. But as far as the Eastern Jin royal family is concerned, it doesn't really want to recover the lost land in the north. More factors are the use of the Northern Expedition as a way to maintain people's hearts, so as to gain the support of the northern expatriates and the southern Han people and consolidate their rule in the south. On the surface, such a peaceful life reflects the decay and weakness of the dynasty, but from the perspective of historical objective development, in fact, the forces of the North and the South were balanced at that time, and neither side had the strength of martial arts. The Eastern Jin Dynasty was southward, which objectively stabilized the political situation at that time, avoided the production damage caused by war and turmoil, and provided a relatively peaceful and stable environment for the economic development in the south.

The ruling policies of the Eastern Jin Dynasty and the Southern Dynasties were beneficial to the development of the southern economy. The government of the Eastern Jin Dynasty took measures to coordinate the contradiction between the gentry of the North and the South, appropriately restrain the powerful and powerful, and develop production. As the first prime minister of the Eastern Jin Dynasty, Wang Dao determined the policy of "Town, Town and People". This is actually advocating quietism, in order to relieve the power of the people. In March of the first year of Jianwu, Ren said: "It is beneficial to the people to reduce the exploitation of people's taxes and reduce the burden of shaking the people." . Wang Dao's policy towards the government of the Eastern Jin Dynasty: The implementation of these measures appropriately restrained the aristocratic forces, benefited the people, and played a role in the stable development of the economy in the south of the Yangtze River through the land division system and the land collection system in the early Eastern Jin Dynasty and the measures to prohibit the strongmen from occupying mountains and rivers. Although political corruption and land annexation began to be serious in the late Eastern Jin Dynasty, after the change of dynasties, Emperor Wu of the Southern Dynasties and Liu Yilong once again adhered to this loose economic policy. During the nearly half century when Emperor Wu and his son were in power, China's southern dynasties were relatively stable politically and developed economically.

As the saying goes, historical events do not exist in isolation. Only by linking up the past and the future can we form an overall objective understanding of history. The economic development of the south of the Yangtze River in the Eastern Jin Dynasty and the Southern Dynasties is not only the luck of being in a favorable climate and a favorable place, but also the promotion of the people and policies of the rulers in the Eastern Jin Dynasty and the Southern Dynasties.