Abstract: Hydrogeologic spatial information system (HSIS) based on GIS, supported on application models system of groundwater and environment evaluation, is composed of spatial database management module, models management module, spatial analysis module, spatial data’s inquiry and index module, spatial data conversion module and system management module. The application of HSIS in Hexi corridor shows that this system is useful to evaluate groundwater and environment, to realizes dynamic management for the information of groundwater and environment, to explore the law of groundwater chemical composition formation and distribution in this area.With the help of this system, the regional groundwater resources and extracting potential are calculated and analysed. When integrated with the model of groundwater flow numerical simulation,this system can realizes the automation of calculating process and the visualization of calculating results. The geology ecoenvironment quality in Heihe basin is evaluated by synthesis evaluation models provided by HSIS. The evaluation results show that the environment quality is better in the middle and the upper reaches of Heihe River but becomes worse in Ejina basin situated on the lower reaches of Heihe River,which well reflects on the whole the current situation of regional geology ecoenvironment.

Key words: GIS, groundwater and environment problems, HSIS, application models system