Abstract: The densely populated and economically developed Changjiang River delta and its adjacent area will be the reigon vulnerable to the sea level rise in the next century. Sea level rise would result in:1)retreat of coast,vertical erosi on of tidal flat and increase in length of eroding coastline;2)decrease in area of tidal flat and wetlands due to erosion,i-nundation and reduction in deposition; 3)increase in frequency and intensity of storm surge,which would threaten the coastal protection works and the protected coastal low-land;4)impeding drainage of Lixiahe lowland and eastern lowland of Taihu Lake region and exacerbating flood and waterlogging disaster;5)increase in salt water intrusion into the Changjiang River estuary.Comprehensive impact assessment of sea level rise in this area shows that the Changjiang River delta is the area most severly effected by sea level rise and the next is the northern bank of Hangzhou Bay and the abandoned Huanghe River delta,and the area most slightly effected by sea level rise is the north Jiangsu coastal plain.