Abstract：This paper tries to assess the hazard of landslide of Wanzhou in Three Gorges Reservoir by using geographical information system(GIS) and information value method. Landslide locations were identified in the Wanzhou Region from interpretation of aerial photographs，maps of the topography and field surveys. Those data were collected and constructed into a spatial database with the help of GIS. Using the eight factors of elevation，slope gradient，slope aspect，lithology，proximity to rivers，proximity to roads，building distribution and the proximity to dividing line of Shaximiao Formation and Suining Formation，a GIS-based assessment process is made to evaluate landslide hazard with information value method. Elevation，slope gradient，slope aspect data were derived from contour map. Lithology data were extracted from the geological map. Proximities to rivers，to roads and to dividing line of Shaximiao Formation and Suining Formation were analyzed from river map，road map and geology map using buffer analysis function of GIS. Building distribution data were classified from the Landsat ETM+ satellite image. All above data were organized into spatial database for next works. The model of information value is used to produce a map of slope instability. With the help of GIS，remote sensing and information value model，the probability of landslide occurring can be predicted. The results of the analysis were verified using the landslide location data. By the comparison between the result predicted and the actual distribution of landslide，the high consistency between them can be found. At last，some characteristics of Wanzhou landslide have been summarized.
