Social security In public green spaces has several positive and negative feedback from the community Social security reasons to provide socio- economic dynamics. Social security in public green spaces that people with different levels and base of economic and social are present, is the basic requirement. In this regard, the authors selected a national park area is a function of social security that they examined .The method descriptive - analytical application is the goal. Data in either library (upper records) or field surveys (questionnaires) have been gathered. A sample of 100 persons was selected and sampling as well as non-probability - not accident. After entering data into spss software tests ANOV A, T -test T -independent two- sample were also analyzed by Pearson test. The results demonstrate that linguistic harassment indices of with a mean value of 2.78 were the largest decline in the nation's security in the Mellat Park. After these respectively indices, visual harassment whit 2.74 and physical harassment whit 2.26, lead to reduce the amount of security in the area have been studied. Also the insecurity among women is more than men. Continue based on Pearson's test showed that the correlation between age and insecurity is - 0.811. This illustrates an inverse relationship between these two variables. , insecurity decreased with increasing age and vice versa. The correlation between education and insecurity - 0.867, compared with age is more correlated with the variable insecurity. The following suggestions are offered to increase social security in the Mellat Park.