Modeling and evaluating land suitability is one of the main prerequisites for urban land use planning. Integration of GIS and Spatial Multi Criteria Group Decision Making tools have been considerable role in this research field. In this study, modeling residential land suitability has been carried out using Fuzzy Spatial-Group Multi Criteria Decision Making, TOPSIS-OWA and GIS in Kermanshah region includes Kermanshah, Harsin, Sahneh, Songhor and Kangavar cities. Ten criteria maps include climate, topography, type of Land, land use, land cover, road accessibility, energy accessibility, latitude, crowd population, zoning earthquake hazard and water resource accessibility have been selected and modeled by OWA and IOWA methods based on the opinion of 4 experts. Then the results of first step have been combined by Fuzzy TOPSIS after weighting by considering 3 environmental, economic and social factors. The results of the proposed model show best locations for expanding residential area that satisfy most aforementioned criteria. This result indicates that integration of multi criteria decision making methods and fuzzy phrases by analytical GIS tools, considering the knowledge of a group of experts, can used as suitable approach in evaluating land use. After omitting the protected areas, according the results in the case study area, 7.2 percent of the region is very suitable, 32.6 percent is suitable, 34.2 percent is slightly suitable and 7.5 percent is not suitable.