Due to its neighborhood with Afghanestan and the subsequent problems of this country such as insecurity, weak economic conditions, and lack of proper border monitoring, Khorasan Razavi Province has always been the inhabitat of numerous foreign nationals. Legal and illegal entry of these people has created plenty of issues from different economic, social, and cultural aspects for the citizens of this province. Negative consequences arising from the presence of foreign nationals on one hand and threats that may form from the Trans powers (using the nationals) have emphasized the necessity of considering the passive defense issue.  So, one of the issues that requires further investigation is the security implications of foreign nationals in Khorasan Razavi province in terms of a passive defense approach. The main question of the current research is that of regarding the passive defense viewpoint, how the presence of the foreign national affects the security of Khorasan Razavi province and the Islamic Republic of Iran in general. This study has a cross-sectional study approach and through library studies, along with a comprehensive perspective, different threats are identified in the field. Proposing practical solutions, it attempts to take effective measures in controlling such consequences.