1. The first large-scale migration wave in China's ancient history was from the late Eastern Han Dynasty to the Wei, Jin, Southern and Northern Dynasties. A large number of people moved to the south, bringing sufficient labor and advanced production technology to the south, and the Jiangnan area has been greatly developed. This laid the foundation for the gradual shift of China's economic center of gravity to the south.

2. The "Anshi Rebellion" which happened in Tianbao 14th year of Tang Dynasty (755) caused the second large-scale population migration in ancient China. A large number of people moved to the south, and the south was further developed, especially in the Jianghuai and Taihu areas, which became a new wealth area in China. In the Five Dynasties, the economy of the south began to gradually surpass that of the north.

3. The third large-scale population migration in the ancient history of China was from the "difficulty of Jingkang" at the end of the Northern Song Dynasty to the end of the Southern Song Dynasty. During the Song Dynasty, with the further southward migration of the northern people, the southern economy has surpassed the northern economy in China, and the process of the southward migration of the ancient economic center of China was finally completed.

The war influence of the difficulty of Jingkang

1, ideological change

China's theory of women's chastity has always been valued by Taoists in Song Dynasty since the change of Jingkang. Because the concubines and maids in the northern song dynasty were taken to the north to be slaves and prostitutes. This sense of shame made Taoism give up the idea of emphasizing survival over chastity in the Northern Song Dynasty, and instead strongly advocated that women give their lives to protect chastity. Because of the environment at that time, this concept was gradually accepted by scholars. During the Ming and Qing Dynasties, there were more and more chastity archways for women to be martyred. Between survival and chastity, women can only choose the latter.

2. Destruction in the northern region

After the change of Jingkang, Jin Bing invaded the Song Dynasty on a large scale, and the Northern Song Dynasty perished. Instead, it was the Southern Song Dynasty, with a narrow ruling area, just south of the Qinling Mountains and Huaihe River, and its land area was only two-thirds of that of the Northern Song Dynasty. During the Southern Song Dynasty, the middle and lower reaches of the Yellow River completely lost the traditional farming areas, and the income from land tax was greatly reduced, so the finance began to rely on non-agricultural industries.