The system of personal and psycho-political structures of the policy maker is one of the most important forms of understanding his behavior and decision-making. Although Several factors have an effect on the type of understanding and decision-making of an issue by the policy maker, but without a doubt, the personal psychological constructs Cognitive in the sense of his perception and beliefs play an important role in this process. In this regard, explaining the decision-making of the nuclei to-The title of one of the most important foreign policy challenges that has affected Iran's relations in all dimensions for more than a decade. Without knowing this issue will be incomplete. Therefore, with the aim of investigating the effect of psychology of cognition on the path of nuclear diplomacy, the question of this -Research is that; Ahmadinejad's and Rouhani's cognitive psychology causes the dominance of what kind of leadership style and decision-making model The file is nuclear. Complete victory in the field of foreign policy requires the provision of various factors, such as Foreign policy goals are said to provide "national interests". The find show that spiritual personality tof transformational leadewed by the us e. Itctive in the of nuclear diplomacy has been.