In Yeats`s poems, the existence of Daimon was a great source, a medium of the creation, and a great fruit of his creation, though the poet recognized them as poetic expressions or as highly poetic allegories. So, the Daimon seemed to be a mentally projected Self-consciousness. Yeats, in trying to gain support for a Daimonic system in his philosophy, researched the Brahmanism, mysticism, spiritualism and occultism through the Upanishads of India. In his search for an ultimate reality, he studied the Veda and Tantra as well. As a result of his research, he made a Daimonic system through Hesiod, Heraclitus, Empedocles, and N대-Platonists, ultimately deciding to follow the Romantic Daimonism. When Yeats had said to give up all worldly knowledge, all ambition, and to do nothing of one`s own will, it meant that he could reach the spiritual reality, which is the object of all artists. So Yeats`s Daimon is a powerful and internalized spirit. What he wanted to transmit with this concentration was a wpiritual existence. He took a role in his physical drama and he called it the Daimon from the Daimon`s works. Daimon was a symbol of perfection and a visionalized passion of unconsciousness, which grew out of the microcosm and the natural consciousness. The main function was Anima Mundi or Collective Unconsciousness, which connects the past experiences and the person, the racial instinct, and the racial history of the people. Yeats, who recognized deeply this, called this Daimon as a ‘great self’ of ‘Gostly Self’. This ‘great self’ was on apposite to the ego, an ego of consciousness. Yeats called the Daimon such as ‘unconsciousness’, ‘unconscious mind’, ‘Great Memory’, ‘Anima Mundi’, ‘Thirteenth Cone’, and ‘Thirteen Sphere’ because he thought that this is a psychological underlayer what is called Collective Unconsciousness by Jung. Yeats thought that Unconsciousness was the source of the inspiration to himself. He thought that it is the poet`s responsibility to express what the Collective Unconsciousness says. Therefore, he believed that the artist has to play the role of Daimon and tried to translate all of the spiritual languages for the ordinary people, for the Daimon uses symbols and images, heard through dreams or epiphanies, which only occultists can understand. So with the Unity of Being between occultism and art, Daimon was a creative source itself and Yeats made great works through the Daimon.