The subject of philosophy is absolute existence,, which encompasses other levels, from the Supreme Being to the last levels of existence.The center of existence and the series of beings, which is often interpreted as obligatory, is known in the philosophy of illumination as the "Noor al_Anwar". Suhrawardi in his enlightenment system, after proving "Noor al-Anwar" and his unity, negates the superfluous attributes of that field. He has also offered a novel view of his science and action.Although Mulla Sadra considers his «Gotham sediqin» on the obligatory proof to be close to Suhrawardi's argument, but considering the validity of existence in Suhrawardi's philosophy, he has considered Ibn Kamuna's doubt on his method of obligatory proof.Regarding science and other attributes of God, he has either criticized Suhrawardi's speech or has adopted different opinions with him in some details. In the present article, while expressing Suhrawardi's views on this subject, Mulla Sadra's differences and criticisms against him have been discussed.