Abstract: In a case study of Baota landslide in the reservoir area of Three-Gorges project, a conceptual model for ground water systems in large-scale landslide was established by integrating the studies of groundwater dynamic field, physical-chemical characteristics, environmental isotopes, and temperature of ground water in the landslide. This model includes recharge, seepage, discharge conditions of ground water varying with the environmental factors (e.g. rainfall, reservoir impounding, and artificial surface water recharge, etc.). This is one of the keys to predict the slope stability and to take countermeasures to controlling landslide.