Infrastructure is a unified network , where the occurrence of disruptions in a infrastructure can spread in all parts of the country and the extent of disturbance caused can affect national , economic and … state security . for this purpose , the main purpose of this research is to identify and prioritize effective environmental threats and to provide solutions to principles and principles of passive defense , after reviewing concepts , definitions , upstream documents and studing different types of threats in the field of infrastructure facilities through library and library methods , designing and distributing questionnaires among experts and related experts . then , by preparing questionnaire and prioritization of environmental factors on the basis of swot model and was evaluated by spss software . the results of this study indicate that protection of infrastructure facilities in the field of power plants with passive defense approach requires increasing knowledge of managers and experts in the country in relation to emerging threats , increasing the level of monitoring measures , applying new methods and protective equipment , observance of the principle of dispersion in design and layout of fuel tanks , holding various trainings in preparation , using effective international experiences in the field of safety .