Objectives: This study investigated the relationship between cognitive emotion regulation, emotional problems and attachment style among students in a causal model. Materials and Methods: The sample group included 285 bachelor students of Tabriz University that were selected randomly by multi-stage cluster sampling. The study instruments were revised adult attachment scale (RAAS), cognitive emotion regulation questionnaire and depression anxiety and stress scale (DASS 21). Results: The findings indicated that attachment dimensions predict negative and positive emotion regulation strategies. The cognitive emotion regulation mediated between attachment dimensions and emotional problems. Furthermore, attachment dimensions had a direct and indirect effect on emotional problems. Conclusions: Findings of the current study are consistent with previous findings and theoretical stance indicating the predictability of mental health indices from quality of attachment in student.