One way to understand a lineage and society is to understand the culture, myths, and ancient beliefs associated with it. After the arrival of Islam in Iran, we know a colorful and magnificent bird with Fictional characteristics called the Simorgh, which is not related to the mythical Saenmurv. After entering each period, the mythical Saenmurv undergoes extensive changes with the introduction of new beliefs. In the middle period, his Fictional features become more than the features of his myths, so that some believe that the middle Simorgh is separate from Saenmurv and does not have Avestan and ancient origins. After the arrival of Islam in Iran, its rejection from other civilizations increased and it lost more or less all its mythological characteristics and took on an imaginary and completely Fictional form, but in addition to losing its characteristic His myths are still among the most enduring myths and symbols of Iran. This research, using an analytical-comparative method, has examined the subject and reviewed the transformations that have led to changes in myths. It then traces the mythological Saenmurv up to the Simurgh and seeks to determine the extent to which the mystical Simurgh we know today is connected to the mythological Saenmurv.