Having a deep thought in poets' way of thinking is one of the most important literary researches. One of these concepts is Mysticism. It has an irrefrangible relation with literature specially Farsi literature. Since Mysticism found its way into Farsi poems and mystical concepts based on love to Allah were composed, Farsi literature flourished and improved. One of the poets whose ghazals are full of mystical concepts is Fakhr-al-din Eraghi, the seventh century poet. Despite his great position in mystical ghazal, his poems have never been taken into consideration. We have tried to decode the secrets of his poems. The results show that mysticism and the real love are the building blocks of his poems, and concepts such as Qalandari, lack of attention to the materialistic aspects of life, unity of existence, mortality and immortality, emanation, remembering Allah, and mystical secrecy are among other concepts found in his works.