Abstract: The forecast system of the groundwater resources based on the GIS technology is another newest method to manage the groundwater resources effectively. Its main functions are to input and assign the data of the groundwater exploitation capacity to node, to display and analyze the results come from the modelling and forecasting, to edit the maps of the exploiting wells (or the exploiting units) and to maintain the data, etc. This system is the integration of the MapInfo and the PowerBuilder. It can be used to draw, show and analyze the maps of the groundwater contour, the maps of the groundwater isobath and the maps of the groundwater drawdown in the predictable year by using the GIS technology. Especially, using buffer analysis can realize the quantification analysis of the exploiting wells and the exploiting units in the region where the groundwater levels are the same. These results analyzed by the prediction system of the groundwater resources can be used as the theoretical basis for planning, managing and decision-making on the groundwater resources by the administrations.