Abstract: Taking the draught disasters in Chongqing as an example, with the adequately analyzing of weather background and population, society, economy in Chongqing, the author chooses these evaluation factors: the physiognomy, the frequency of disasters occurring, the population, the economy from the background of disasters, the possibility of disasters and the vulnerability of stricken things. By using hazy evaluation method, this thesis constitutes mathematics model for the background of weather disasters, the possibility of disasters and the vulnerability of stricken things, and at the same time the evaluation was made. Based on the basis datum and maps, with the utilizing MapInfo Professional software, in manipulating the attribute data-base and graphics data-base, the maps of the background of weather disasters, the maps of the possibility of disasters and the maps of the vulnerability of stricken things were gained. By overlaying and uniting of the maps and compartmentalizing of hazard grade, the hazard attributions for draught disaster were achieved.

Key words: GIS, GIS, Chongqing City, Draught disaster, Risk assessment, Division