Introduction: Premenstrual dysphoric disorder is a series of repeated physical, psychological and behavioral symptoms that occur at the end of the menstrual cycle and resolves at the onset of menstruation and disrupts the function of the individual and the way of cognitive emotion regulation influences in development or reducing symptoms of this disorder. The aim of this research was to study ,effectiveness of Psychotherapy with cognitive-behavioral approach in emotion cognitive regulation strategies of patients with premenstrual dysphoric disorder.

Method: This design of the study is pre­-test /post-test control group. The sample include 28 persons (14 group expermintal and 14 group control) of patient premenstrual dysphoric disorder in Mashhad the selected randomly and the were requested to answer Daily Record of Severity of Problem chart (DRSP) and Garnefeski Cognitive emotion Regulation Questionnair (CERQ).Over 8 therapy sessions, each lasting 90 minutes cognitive-behaviour therapy while the control group did not receive any intervention.Covariance analysis was applied to analyse the data.

Result: The result of data analysis showed CBT caused the decrease of cognitive emotion regulation maldaptive strategy (self-blam, rumination and catastrophizing) and increase of cognitive emotion regulation adaptive strategy (acceptance and positive reappraisal) of experimental group of comparision to the witness group (p >0/05 ).

Conclusion: The resalt of this study indicate the effectiveness of Psychotherapy with cognitive-behavioral approach on emotion cognitive regulation strategies of patients with premenstrual dysphoric disorder.