(20 15 Huanggang) During the Eastern Jin and Southern Dynasties, the economy in the south of the Yangtze River developed rapidly, while the economy in the north was increasingly backward. The objective factors leading to this change are social unrest in the north and relative stability in the south.

(20 18 Huangshi) Jiangnan area was once described as "a city with a vast territory and a sparse population" in historical records, but it developed in the Three Kingdoms, the Jin Dynasty and the Southern and Northern Dynasties after the Han Dynasty. The factors of Jiangnan development in this period are superior natural conditions, the migration of northern population to the south and the relative stability of social order.