Background : Cognitive emotion regulation plays an immense role to control mental disorders. The aim of this research was to study the relationship between cognitive emotion regulation styles and impulsivity and students^, borderline personality disorders.

  Materials and Methods: Statistical samples of this study included 200 students of Pyam-e-Noor university. Cognitive Emotion Regulation Questionnaire (CERQ), Barrat Impulsivity Scale (BIS) and Borderline Personality Scale (STB) have been used for data collection. The data was analyzed using Pearson correlation coefficient and multiple regression analysis.

  Results: Between variable of borderline personality disorder, and styles self-blame, rumination, catastrophizing and blaming others there was a positive correlation, but a negative relationship with acceptance, positive refocusing and positive reappraisal styles was observed (p>0.05). There was a positive relationship between variable of impulsivity with styles of self-blame, rumination, catastrophizing and blaming others, but had a negative relationship with acceptance, positive refocusing and positive reappraisal styles (p>0.05). The results of multi-variable correlation coefficient with Enter method indicated that cognitive emotion regulation styles play a role in explaining borderline personality disorder (R²= 0.646) and impulsivity (R²= 0.645).

  Conclusion: Training the effective strategies of cognitive emotion regulation should be considered as a part of the intervention in the treatment of impulsivity and borderline personality disorder.