Abstract: This study ,by making use of the hydrodynamic simulation and the salinized-soil identification method and with the aid of a geographic information system technique, establishes a model for forecasting the effects of a large water-conservancy project on regional water and soil resources through systematic analysis. This model has preliminarily been applied to a section of the "conducting the Huanghe River water to the Baiyangdian lake"Project, namely,the section from Xian County to the Baiyangdian lake. The results show that the forecast is practicable and its accuracy depends mainly on the generalization of the parametric choice and other relevant questions.

Key words: water-conservancy project, hydrodynamic model, water and land resources, geographic information system (GIS).