The main objective of this research is to determine the role of passive defense in urban crisis management from the perspectives of experts and urban managers Municipality of Tehran- District, 5. In order to carry out the study, an analytical-applied research method and a combination of documentary, descriptive, analytical and case study methods are used. All managers and experts of Tehran’s municipality in the District (n=950) at all divisions and departments constitute the population of this study. 274 samples are selected using simple random sampling method. A researcher-made questionnaire is used as research tool whose validity and reliability are tested based on the views of the research supervisor, advisor, experts and managers of the municipality, and Cronbach's alpha test (a= 0787), respectively. Then, data analysis is performed using SPSS software (v21). According to the research findings, passive defense is effective in reducing damages to cities and application risk, and developing a proper pattern for urban sustainability using experts and managers perspective (p<0.05).