Mysticism and Sufism is one of the most influential currents in the history of Islam, which can be studied from various epistemological, political, social, artistic, etc. angles. This trend has many different branches and slogans both in its theoretical and practical dimensions, which have digested from thinkers and scientific and religious elites to the general public who do not benefit from religious awareness. One of the influential figures in the history of Islamic Sufism, who is known as the Elder of Turkestan due to his deep influence in Turkic-speaking lands and is considered the greatest Turkish Sufi, is Khwaja Ahmad Yesavi. The collection of Khwaja Ahmad's poems, written in a Turkish language that is understandable for the general public, has been collected in a book called Diwan Hikmat and translated and published in various languages. In these poems, he has expressed his mystical views about explaining the steps of his conduct and mystical advice for others. The present article is trying to discover and outline the system of mystical thoughts of Khwaja Ahmed Yesavi in the field of theoretical and practical mysticism and present a clearer picture of his mystical foundations..