BACKGROUND AND OBJECTIVE: The Psychology of "self" is defined as the ordering of human experience and behavior. The aim of this study was to examine the relationship between childhood and attachment damages with the integrity of the "self" in people with borderline personality disorder. METHODS: This descriptive correlation study was conducted on 100 patients with borderline personality disorder referred to a psychiatric clinic in Sari hospital, aged 55-18, who were selected by convenience sampling method. Evaluation of the "cohesion" was done using 12-item questionnaire cohesive self-knowledge, 12-item childhood damages of Boglas Brimner and attachment styles of Hazan and Shaver. FINDINGS: The emotional damage had a negatively correlation with secure attachment (p<0.05). Physical damage in childhood had a significant negative correlation with an avoidant attachment style and the correlation coefficient was 231/0 (p<0.05). General damages in childhood had a positive and significant relationship with ambivalent attachment style and the correlation coefficient was 0.239 (p<0.05). CONCLUSION: According to the results of this study, safe and avoidant attachment styles had negative relationship with physical and emotional damages in childhood, whereas ambivalent attachment style was positively correlated with childhood damages.