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Disaster reduction and sustainable development require understanding and explaining the true nature and extent of the communities and places of natural hazards (earthquakes) is. Therefore, assessment of social vulnerability to earthquakes in cities of various sizes can play a role in risk assessment and management of these natural phenomena can play. The study of character development - practical, descriptive - analytical, objective assessment and prioritization of social vulnerability in the face of natural hazards (earthquakes), and using TOPSIS quantitative models and GIS, Excel and SPSS software to the issue is discussed. Also, in order to reduce the error rate to determine a more accurate forecast of 50 sub-indices of social variables - economic, physical-the physical and Yazd populations were analyzed. The results show the vulnerability of the region average 0/412, the second with a rate region TOPSIS the, 0/642 percent of the most vulnerable regions, Region 3 with the TOPSIS, 0/411 percent, and the region 1of moderate vulnerability with the TOPSIS, 0/183 percent of lowest social vulnerability to earthquakes in the area has Yazd city. 0/183 percent of lowest social vulnerability to earthquakes in the area has Yazd city. 0/183 percent of lowest social vulnerability to earthquakes in the area has Yazd city.

Keywords: TOPSIS, GIS, social vulnerability, Earthquake, Yazd City, TOPSIS, GIS

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