本文以历史资料讨论了两宋年间太湖地区水患的成因、苏北平原以及杭州湾两岸海岸线的后退,认为造成这种环境演变的背景是海平面的上升。北宋年间黄河的濒繁改道及长江口水动力轴线的南移也是海平面上升的结果。北宋初年(10世纪中叶)至南宋中期(13世纪初)海平面上升的幅度约1.5～2米,最高海面约比现代海面高1米左右。 Based on historical data, this paper discusses the causes of flooding in the Taihu Lake region between Song and Song Dynasties, the retreat of the northern Jiangsu Plain and the coastline along the Hangzhou Bay, and suggests that the background of this environmental change is the sea level rise. The Northern Expedition to the Yellow River and the southward shift of the hydrodynamic axis of the Yangtze Estuary during the Northern Song Dynasty were also the result of rising sea levels. In the early Northern Song Dynasty (from the middle of the 10th century) to the middle of the Southern Song Dynasty (early 13th century) sea level rise was about 1.5-2 meters, with the highest sea level about 1 meter higher than the modern sea level.