Given the advances in technology and the radical changes in weapons, the need to apply modern passive defense to reduce the casualties of war, especially in cities, is felt beforehand. This research is of practical purpose and descriptive-analytical method was used and the variables considered include identifying crucial, critical and important locations of Tabriz city, in order to reduce the damage caused by enemy attacks and to increase the defensive strength and threshold of city resistance. The method of data collection was library and field studies (questionnaire) were used as well. In this study, a matrix method was used to check the conformity of Tabriz urban system with principles of passive defense that identifies the city and the consequences of the concentration of a number of centers there. The results of the research after CARVER matrix stage and evaluation of 30 administrative-service centers of the city indicated that 11 centers are crucial (score between 70-100), 13 centers critical (score between 40-69) and gradually 6 centers important (score between 9-39), which are not located in accordance with the principles of passive defense and the issue of urban defense. Therefore, the results show the importance of existing centers in this city and by applying passive defense principles, locating the administrative-service centers of Tabriz as a vulnerable city in cases of potential enemy threats and natural disasters can be found. In this way, prior to the outbreak of war, it is possible to reduce the loss of life and financial damage to the strategic points of the city, where the survival of the city depends upon.