ibn Sina has stated many proofs to prove the abstraction of the rational soul. By those he has proved that the intellect faculty is not substance and physical (temporal). Fakhr al-din al-Razi studies and criticizes all of these proofs. Some of his criticisms seem incorrect and they have taken from insufficient careful examination (vision) to the Ibn Sina’s bases. Because he confused the knowledge by presence (alilm al-huzuri) with conceptual knowledge (al-ilm al-husuli), unconditioned feature of quiddity with negatively conditioned feature of it, the activity of rational soul aspects with the ability to the rational soul aspects in his criticisms and he involved in confusion in their problems (matters). But some of his criticisms are true and reasonable like problems concerning to the imaginative faculty and its immateriality and Ibn Sina’s principles are not able to answer them because some of his proofs prove the abstraction of the imaginative faculty but Ibn Sina believes it is material.