For helping professional personnel analyse and evaluate the groundwater resources exploitation potentialily, a model of groundwater resources exploitation potentiality evaluating is designed with the index of quantity of unit's area being adopted, GIS overlay analylical method being used and the space database of groundwater resources being taken as the basis. Based on MAPGIS 6.5 secondary development function LIB, the groundwater resources exploitation potentiality evaluation software has been developed under VC 6.0 environments. The software interface is easy to operate, can choose the evaluation index according to the concrete conditions. The data used for evaluation stem from space database, and the results are kept m the form of space data.