The purpose of this research was to investigate the relationship between mental health and the mediation of life expectancy among the Basiji brothers of Yasuj city. The statistical population in this research is 100 Basiji brothers of Yasuj city, according to the table of Karjesi and Morgan, the statistical sample of this research is 80 people who are They have been chosen randomly. The tools used in this research include 1- 28-question mental health status questionnaire and 12-question Schneider life expectancy questionnaire. The dependent variable of life expectancy is the independent variable of mental health. In order to inferential analysis of data and hypothesis testing, inferential statistics (Kolomgrov Smironov tests, Pearson correlation coefficient and Kruskal Wallis test) have been used. Parametric tests are used to analyze research hypotheses. The significance level of alpha is considered to be 0.05. The results of the tests showed that there is a significant positive relationship between mental health and life expectancy among the Basiji brothers of Yasouj city, and as mental health increases, life expectancy also increases.