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Two methods and a system for the measure against slope failure disaster using GIS are proposed in this paper. 1) Method of extracting cliff and potential area, suffered from slope failure, by DEM and Landuse data. 2) Method of extracting potential slope failure area by rainfall data, and a system of conveying this information to local residents. These methods can be applied to many places where these data are available. Moreover, dangerous cliffs and the areas are extracted at the same time even in wide city area. These methods will allow us to extract dangerous cliff and area without fieldwork, and this information will help local residents with proper actions. Minami ward, Yokohama city, was selected as a study area.