Development of geoinformation technology overruns requirements of most environmental inventors but does not satisfy needs of environmental modellers. At least, the homogenous multi-parameter territorial units are accepted as course scenes of various environmental processes and as addresses for optimising measures. The present environmental GIS are used for data storage, processing, documentation, analysis, modelling, as well as promotion and visualisation of suggested environmental measures. Four classes of environmental GIS are distinguished: 1. standard GIS with multi-layer analytic database used mostly for inventory; 2. developed GIS with multi-layer analytic and evaluation product database; 3. extended GIS, supported by simple expert systems (standard SW extensions) for static modelling procedures; 4. specialised GIS, based on modules representing expert knowledge for solving and/or modelling of selected problems.