The study of the realm of religion and its social role has long been in the spotlight in various scientific fields. Secularization is one of the most important concepts in the field of sociology of religion. Some argue that secularization is the inevitable future of all developing societies. In Iran, which has a structure intertwined with religion, this issue has always been of fundamental importance. In this article, using the documentary method, the formation process and the results of secularization in the Pahlavi dynasty and the period after the victory of the Islamic Revolution were studied. The results show that the Pahlavi government paid much attention to the policy of secularization and tried to expand it in all areas, which ultimately saw the failure of secularization policies and the emergence of a revolutionary movement through popular protests based on Islamic discourse. In the period after the victory of the Islamic Revolution, due to the depth and attachment of Iranians to religion and Islam, we are witnessing an integration path in society, the solution of which is to try to integrate religion and the modern situation theoretically and practically.