Background: Previous research shows that neglecting the basic needs of the child or physical and sexual abuse during the first years of life has a significant relationship with developing of BPD symptoms. So, the present study aimed to investigate the moderating role of self-knowledge processes and self-control in the relationship between childhood traumas and the severity of borderline personality traits. Materials & Method: Based on convenience sampling method 109 individuals were assessed by Child Abuse and Trauma Scale (Sanders & Becker-Lausen), Integrative Self-Knowledge Scale (Ghorbani, Watson & Hargis), Mindfulness Scale (Brown & Ryan), Self-Control Scale (Tangney, Baumeister & Boone), and the Borderline Personality Scale (Claridge & Broks). Result: The hierarchical regressions showed that mindfulness, self-knowledge and self-control can predict the severity of borderline personality traits directly (p <0.01); however, they did not play the moderating role (p> 0.01). Conclusion: Self-regulation processes do not moderate the severity of traumas and borderline personality traits and they merely act as predictor variables.