Objective: The aim of this study was to investigate the effect of optimism training on the psychological security of addicted parents' primary school children in Zahedan. Method: A quasi-experimental research design along with pre-test/post-test and control group. The statistical population of this study consisted of addicted children aged 7 to 11 years old who had come to addiction centers in Zahedan city. From among them, 30 subjects were selected based on the entry criteria and were randomly assigned to control and experimental groups. Maslow's Security-Insecurity Inventory and Life Orientation Test were administered to the subjects. Results: The results of this study showed that optimism has been effective in the improvement of mental health in addicted parents' children. Conclusion: Therefore, optimism training can lead to psychological security among addicted parents' children.