The current study examined the relationship between psychological security, emotional maturity, and attachment styles and marital adjustment. This research method is correlational descriptive. The population of the study included of all 450 married female students studying at Islamic Azad University in North Tehran Branch in the second semister of academic year 2015-2016, that 130 of them were selected as sample of study using available sampling method. Maslow Psychological Security Questionnaire, Yashviringh Emotional Maturity Questionnaire, Hazen - Shaver Adult Attachment Scale, and Locke-Wallace Marital scale were used to collect data. Data were investigated using multivariate regression correlation and they were analyzed using SPSS software. The results showed that there is a significant relationship between the psychological security and emotional maturity and attachment styles, and 31% of changes in marital adjustment are explained through these variables. There is a positive relationship between pyschological security and marital adjustment. It was also found that there is positive correlation between psychological security and marital adjustment. The coefficient was equal to 0.462 and significant at 99% level. There is also a positive significant relationship between emotional maturity and marital adjustment, and the correlation coefficient is equal to 0.466 and it is significant at 99% level. There is also a relationship between attachment styles (secure, avoidant and ambivalent) and the marital adjustment.