The overall goal of this research is to determine the importance of affecting factors for site selection in parks and urban green spaces and also a suitable site selection for parks in the study area.  Methodology of this research is an analytic descriptive research. At first by using library and literature review and Delphi approach effective parameters in site selection of parks were extracted and then, pair wise comparison performed in FAHP method with relevant experts to determine significance and weighted of criteria. Then, data layers standardized in IDRISI software and were prepared in the form of Fuzzy. And finally prepared Fuzzy maps overlaid in GIS software by considering their weights to identify suitable locations for the construction of parks in region 7 of Tehran municipality.