The aim of this study was to investigate the relationship between attachment style, rumination and defense mechanisms in women with obsessive beliefs. This research is descriptive and correlational. The study population consisted of all women in Tehran Using multi-stage cluster sampling, 300 of them were selected And each attachment style questionnaire, rumination, defense mechanisms and obsessive beliefs were completed. The results showed that secure attachment style negative correlation with obsessive beliefs As well as between insecure attachment styles anxiety, rumination and immature defense mechanisms of neurotic and there is a significant positive correlation with obsessive beliefs. And that secure attachment and insecure attachment styles anxiety, rumination and immature defense mechanisms and neuroticism can predict with obsessive beliefs. So we can safely conclude that Drvnkary models and insecure attachment relationships within Neonate mother are formed through the establishment of unsafe models can provide ground for the emergence and persistence of vulnerabilities. Thereby reducing the use of rumination and immature style and neuroticism is an important step toward improving mental health.