The system of water exploitation license applied to water resources management was hard to solve the problems of over withdraw of groundwater and the resulted land subsidence attested by the cases occurred in Suzhou-Wuxi-Changzhou areas, and the purpose of groundwater management should be aimed at a proper pumping on premise of geo-environment protection. The authors conducted exploratory and supplementary design on the current groundwater management system in land subsidence area of Yancheng and Dafeng in northern Jiangsu coastal areas with emphases on trading water exploitation license model and groundwater resources management mechanism, providing trains of thought for the local management of groundwater resources in the study area.