Historical facts (list three of them):

In agriculture, Zhancheng rice introduced from Vietnam is popularized in Jiangnan. Suzhou and Huzhou in Taihu Lake Basin become granaries; The output of rice, which is mainly produced in the south, ranks first in grain output; The planting and cultivation of cotton and tea trees extended to the south of the Yangtze River.

In terms of handicraft industry, the silk weaving industry in the south is better than that in the north; The cotton textile industry develops to the southeast coastal areas; Jiangnan area has become the focus of porcelain industry; Ice crack porcelain fired in Zhejiang Geyao; Jingdezhen gradually developed into a porcelain capital; The shipbuilding industry in Guangzhou and Quanzhou on the southeast coast is developed.

In terms of commerce, Hangzhou was the largest commercial city in the Southern Song Dynasty. Guangzhou and Quanzhou on the southeast coast are world-famous large commercial ports; The government's fiscal revenue mainly comes from the south, especially the southeast.