sadr al-Din al-Shirazi (Mulla Sadra) benefits from the different principles and assumptions in the philosophical clarification of the phenomenon of revelation. In this essay, the author has tried to extract these principles and assumptions from the texts out of Mulla Sadra’s writings and has tried to explain the relationship between each of them with the revelation. The philosophical principles of the revelation-ology of Mulla Sadra are: believing in God and ascribing some special attributes to Him, the combination of the soul and the body, the existence of the powers of perceiving the revelation knowledge, the longitudinal system of the universe and the personal capacity of the prophet, active intellect or the “giver of forms” (wahib al-suwar), celestial souls and their knowledge to the details of the natural sphere, the continuity of the prophet’s soul to the imaginal world (al-’alam al-mithal) or contiguous imagination and the same root (origin) of the revelation and ro’ya (dream). In the following paper, each of the mentioned principles have been examined (analyzed) and the role of each of them in the revelation-ology system of Sadr al-Muta’allihin has been argued.