Producing Range Suitability Map for Sheep Grazing Using GIS (Case Study Taleghan Region in Tehran Province Hossein Arzani professor University of Tehran, Iran Email: harzani@ut.ac.ir Shahram Yousefi Mr. Post grad. student M. Jafari Professor College of Natural Resoures Email: mjafari@ut.ac.ir M. Farahpour Dr. Institut of Forest and Rangeland Abstract Range suitability is one of the most important factors in rangeland management. All of rangeland ecosystems component affect range suitability and investigation about them is impossible, in this study physical and vegetation factors were evaluated. Tree models, including production model, water model and erosion sensibility model made final model to create final range suitability map. FAO (1991) method (recommended for land capability evaluation) was used for suitability classification and GIS was used to integrate various layers of information and sub-models. The study area located in 50˚, 36َ, 43ً - 50˚, 53َ, 20ً longitude and 36˚, 5َ, 19ً - 36˚, 19َ, 19ً latitude, in the middle area of Taleghan watershed, with the area 37977 hectares. According to the results, among physical characteristics; slope, sensibility of stone and soil to erosion, elevational precipitation from physical characteristic and among vegetation attributes cover, production, range condition and range condition trend together are most effective factors for determining suitability classification to create range suitability map. In the study area the most limiting factors are high slope, changing of rangeland to dry farming, presence of stones sensitive to erosion, poor cover and early grazing. On the other hands, much ground cover including vegetation cover, stone and pebble, good distribution of water resource, number of water resources and presence of perennial species increase Taleghan rangeland suitability for sheep grazing.