64 страниц. 2012 год. LAP Lambert Academic Publishing In this study, at first was determined system boundary and effective endogenous and exogenous variables. Then, was studied reference variable behavior. After that were determined dynamic assumptions and was prepared conceptual model and cause-effect diagrams. At finally, modeling was performed by definition of parameters and structuring of dynamic theories in "Vensim PLE" Software for 20 years periods . the obtained model was tested in extreme conditions . Analyzing of reduction process of urban open spaces in process of cities development in Tehran metropolis is the purpose of this research. The research method is analysis – descriptive. Also data collected is documents – field. The results show that will be controlled reduction process of urban open spaces with usable in crisis conditions in Tehran metropolis by modification of destructive mechanisms also using policies that associated with key variables.