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      Background &amp;amp; Aims of the Study: According to the report of world health, organization mental disorder is one of the important causes of disability in the world and it can result in decrease in the success and advancement of employees. Thus, the purpose of this research is evaluation and comparison of mental health status and its related factors in female employees who take part in morning exercise and who are exempt in one of the police units. This is a descriptive-analytic and cross sectional study. Materials &amp;amp; Methods: The population of this research included 85 female employees who took part in morning exercise as one group and the other group included 65 inactive people who were ill and exempt from exercise. The measurement tool in the research was the Goldberg and Hiller questionnaire of mental health that was consisted of 28 questions. Various studies in the world and in Iran suggest the high validity and reliability of the GHQ-28 questionnaire. The validity of the questionnaire has been approved in more than 70 countries and its reliability has been estimated to be between 82% and 92% in different researches and in different social groups. The data were analyzed using the descriptive statistics (frequency, mean and standard of deviation) and deduction statistics (independent t-test) in SPSS 16 software. Results: Analysis of the research hypotheses at significant level (p<0.05) showed that morning exercise had significant effect on mental health and its subscales such as physical complaint, anxiety, social dysfunction and depression in employees. Moreover, a significant difference was observed by comparing the active and inactive groups in relation to mental health and its subscales. Conclusions: The results of the research show that the effect of exercise and physical activities on mental health can&amp;#039;t be denied. According to the researches that have been done, exercise is effective in two aspects of physical and mental.