In this article the hierarchy of existence and its features in the works of Mulla Sadra and Allamah Tabatabai are compared with each other. This hierarchy is studied by both of these two scholars with different subjective considerations and philosophic gnostic approach. Although some matters are not original with them and are discussed in gnosis. But the purpose of this article is the discussion on matters about the hierarchy of existence found in the works of Sadra and Allamah. In the transcendental theosophy، on the basis of correspondence between man and world، creatures are ranking in three degrees: the world of intellect، the world of similitudes and the natural world. They are all one single reality، but of multiple degrees. To sum up، there is no considerable difference between these two scholars in this theme. Although Sadra was influenced by great gnostics، such as Ibne Arabi، he divided existence to different hierarchy.