What are the characteristics of China's economic structure in Song and Yuan Dynasties?

(1) the rapid economic development in the south, the economic center of gravity moved south, the feudal mode of production expanded to the frontier, and the process of feudalization of ethnic minorities accelerated.

(2) The land trade in the north was blocked, and the overseas trade in the south developed unprecedentedly.

Reason:

In the Jin Dynasty, the economic center of China began to move south, but the economy was still dominated by the north. After the Anshi Rebellion in the Tang Dynasty, the economic level of North and South was equal. By the Battle of Jingkang in the Song Dynasty, the economic center of China had completely moved southward in the Southern Song Dynasty. The south, especially the Taihu Lake area in the south of the Yangtze River, is even more prosperous. The movement of economic center moves with the occurrence of war and the flow of population. By the Southern Song Dynasty, after several generations' operation, the southern region of China was rich in products and strong in economy. However, in the north, due to years of war, the population is sparse and the land is barren.