Abstract: The aim in integrating multi-criteria evaluation with Geographical Information Systems (GIS) is to provide more flexible and more accurate decisions to the decision makers in order to valuate the effective factors. A GIS has been used to match the suitability for wheat crop based on the requirements of the crop and the quality and characteristics of land. The methodology used for the physical land suitability analysis for wheat is a multi-criteria evaluation approach within GIS context. This study, land suitability evaluation based on FAO has been determined for wheat irrigated area about 5400 ha, the South of plains Damghan. The study was carried out by overlapping all individual maps (soil map units, soil depth map, slope map, texture soil map and soil fertility) with GIS techniques for physical land suitability classification. The results show that 21.94% of the area is moderately suitable (S3) and 9.40 not suitable (N1) and 68.66% severe limitations and unchangeable (N2) for wheat crop. Lack of irrigation suitable water, Exchange Sodium Percent (ESP) and salinity (EC), insufficient rainfall and poor soil fertility are the most serious problems influencing yield and quality of wheat.