Purpose: The purpose of this research was to combines quantitative results of researches conducted on mental health of older people.

Methods: For this purpose, using quarterly and journals, all research was collected throughout the country during 1384-1394 that 30 researches were selected for meta-analysis .these studies were selected, based on research methodology components such as sampling methods, research methods, statistical methods, validity and reliability of the questionnaires.

Results: Combination of effect size by Schmitt and Hunts method shows that, variables Such as Social capital, physical activity, marital, non-residence in nursing homes, well-being, gender, economic status, education and various treatment methods related to mental health. There was no association between age and mental health.

Conclusion: The findings of this study shown that individual, social, psychic and demography factors can influence the mental health of older people. This information could be used in health planning, treatment and care. This information may increase the mental health of older people