1. First, the population distribution pattern with a large population in the north and a small population in the south began to change, and the population in the south increased rapidly. Secondly, it has promoted the rapid economic development in the south, promoted the transformation of extensive agricultural production mode of "boiling water" in the south of the Yangtze River to intensive agricultural production mode, and improved grain output and land utilization rate. It laid the foundation for the historic shift of China's economic and population center of gravity from north to south.

2. The geographical distribution pattern of China population has changed fundamentally. So far, the population size of southern China has reached the level of equal shares with the northern region for the first time, even surpassing the northern region.

The migration of a large number of people from the north to the south has greatly promoted the social development in the south. With the migration of a large number of labor force and advanced reclamation technology from the north to the south, most of the original "wild land" has become a "land of plenty", and the situation that the north and the south are merged in customs and habits, and the south's economy is stronger than the north's has been completely established.

Generally speaking, these three migrations were all due to the war. There are a large number of migrants and a wide range of strata, from royal aristocrats to monks and nuns farmers; They are scattered in Hunan, Zhejiang, Guangdong, Guangxi and even Hainan. Although they are nostalgic for their homeland, once they enjoy the superior natural conditions and relatively relaxed political environment in the south, they can start a business and multiply in the south with peace of mind, promote the development and economic development of the south, strengthen the integration and unity of ethnic groups, and derive a tasteful and dynamic Jiangnan culture.

Generally speaking, these three population movements to the south were all caused by war; There are a large number of migrants and a wide range of strata, from royal aristocrats to monks and nuns farmers; They are scattered in Hunan, Zhejiang, Guangdong, Guangxi and even Hainan. Although they are nostalgic for their homeland, once they enjoy the superior natural conditions and relatively relaxed political environment in the south, they can start a business and multiply in the south with peace of mind, promote the development and economic development of the south, strengthen the integration and unity of ethnic groups, and derive a tasteful and dynamic Jiangnan culture.