The paper tries to explore W. B. Yeats`s poetic representation from the perspective of decolonizing process approach as a respect of reconstruction of established mythology. Yeats has been generally considered as a romantist, occultist, and even modernist. However, this paper regards Yeats as a decolonialist living in a colonial society, and attempts to locate Yeats in the context of decolonialists` view including Frantz Fanon, Edward Said, and Gayatri Spivak. Decolonizing process as a literary reading is becoming an influential textual strategy rather than remaining as one of the academic master discourses. So far, the established textual reading theories have been closely related to logocentrism, and they failed to be acknowledged as an objective way of reading. For this reason, the decolonizing process has an important implication in the sense that it subverts the colonial ideology within the context of colonized society, and at the same time, reconstructs counter-discourse to find out self-identity and decolonized space. I try to examine the process of his poetical writings and his attitude against colonialism. To do this, my major interest is in his myth and language employed in his poetry. And I attempt to search for the true Irishness in which Yeats makes every effort to materialize the reality of Ireland in his poetry. To sum UP, the decolonial discourse and its textual strategy have important implications that lay bare the dominant ideology hidden in the seemingly impersonal intention of imperialism.