Mir Mohammad Ismail Khatunabadi, one of the 11th century philosophers of the Tanzihi school of philosophy in Isfahan, has criticized the opinions of other commentators of the book "Al-Kafi", especially Sadrul Mutalahin, in his commentary on "Usul Kafi" under the narrations of "Bab Ruh". This descriptive-analytical article has examined the opinions of Khatunabadi and Mulla Sadra about the soul and has come to the conclusion that according to Mulla Sadra, the reason for the inability of human science and reason to understand the truth of the soul is the greatness of the soul; But according to Khatunabadi, the source of the dispute about the truth of the soul is its verbal form, which is a generic noun and has a general meaning. According to Sadr al-Mutalahin, the soul, in the simplicity of existence, cannot be discovered except through divine knowledge; But Khatunabadi sees this view as a result of Sadra's intellectual basis in material movement, which according to Khatunabadi is invalid. In general, it should be said that the difference in the views of Mulla Sadra and Khatunabadi is due to the difference in their philosophical foundations. Khatun Abadi does not accept the essential movement, the unity of existence and the definition of existence presented by Sadr al-Mutalahin and considers them invalid; Therefore, his point of view, where these principles are involved, is rejected and rejected by Khatunabadi.