Background: The human being always prone environment of the threat and the need to make the right decision is in these circumstances that require the application of knowledge is irrefutable. Given that today's passive defense has played an important role in reducing the vulnerability of KM initiatives aim of this study examined the effects of passive defense in Sistan and Baluchistan Red Crescent society organizations as one of the most influential organizations in this field.
Method: In this causal approach and applied research, data gathered using questionnaire. The validity and reliability was confirmed due to the experts’ opinions and Cronbach's alpha coefficient (0/8).  However, about 310 out of 1600 relief workers were selected by using random sampling and it is used Kolmogorov-Smirnov (K-S) test, Pearson correlation, Structural Equation Modeling, SPSS-19 and AMOS.
Findings: According to the desirability of significant levels and confirmation of research hypothesis, knowledge management has a significant impact on passive defense in Red Crescent society of Sistan & Baluchistan (0/843). The components of KM coefficient are as follows: knowledge creation (0/749), absorbing knowledge (0/809), organizing knowledge (0/808), storage knowledge (0/804), diffusion of knowledge (0/918) and knowledge application (0/717) have a significant impact on passive defense. However, with the increase or decrease in knowledge management and its components, passive defense is affected by the mentioned factors.
Conclusion: The results showed that knowledge management and its components have a significant impact on passive defense so that strengthening each of the mentioned factors can improve implementation of passive defense. Therefore, managers should always try to consider KM (which is now an integral part of their duties at all levels); and provide opportunities for all KM initiatives to execute in the organization. Since, passive defense has grown dramatically all over the world; there is a greater need for KM with the passing of time; however, a scientific approach improves the passive defense.