Huaihe River has always been an important political dividing line between North and South in history. According to the statistics of some China war historians, there are more than 200 famous battles in the history of China, among which nearly14 took place in the Huaihe River basin, such as the famous Feishui War. With the frequent northern wars and the subsequent migration of population to the south, the economic center in Tang and Song Dynasties began to develop from the Yellow River basin to the middle and lower reaches of the Yangtze River.

In addition, the Sui Dynasty opened canals, connecting the north and south, the rivers and the Huaihe River. "Jianghuai is familiar, and the world is full." Jiangnan has gradually become an equal with Huaibei, and even surpassed it. In the Tang Dynasty, Han Yu once said, "Today, the husband was born in the world, and Jiangnan was in the 19th century". The real decline of Huaibei began in the second year of Jianjian in the Southern Song Dynasty (1 128). No matter its political and economic status or ecological environment, Huaibei has lost its former style.

After the change of Jingkang, Emperor Gaozong established the Southern Song Dynasty. However, the Jin army attacked again, but Emperor Gaozong was not determined to fight the ruler. He dismissed Li Gang, who reorganized the imperial court to resist gold, and rejected Zong Ze's request to return to the capital of song dynasty (now Kaifeng) to take charge of the overall situation. Zong Ze, a veteran of the resolute anti-Japanese war, died of grief and indignation, and Emperor Du Chong took over the defense of Kaifeng Prefecture. As soon as 8 jin j heard that Zong Ze was dead, he decided to go south. With the breach of the Yellow River and disrepair, the water conservancy environment has gradually deteriorated, so the river is blocked, the drainage is not smooth, and the water supply is not as good as the water conservancy repair. A slight drought or flood will turn into a disaster.

These disasters, such as floods, droughts, locusts, etc. , gradually swallowed up people's financial resources. After human intervention, the Yellow River brought the Huaihe River into the sea. In Huaibei, it has been raging and submerged for more than 700 years. During this period, the people's strength was greatly damaged, the original good ecological environment in Huaibei deteriorated completely, the good water system was destroyed, rivers and lakes were leveled by silt, and water storage and drainage were affected. Therefore, in a series of chain reactions, the more, more serious and more frequent natural disasters people in Huaibei suffer, the more financial resources they consume, and the result can only be poorer and poorer.