Many contemporary writers analyze yeat''s poems with the view of postcolonialism based on the history of Ireland. However, it is not easy to determine whether his resistibility and duplicity should be considered as a postcolonial literature or not. Even today, this is a controversial issue among critics and no clear decision has been made yet. For this issue, I focus on his resistant characters and hybridity in his poetry. Yeats seems to be tormented by internal dilemma because he takes his stance aligning himself with Great Britain while he appeares to despised it. We can see it especially in the case of the poetic symbol ‘rose’. It connotes various meanings such as typical symbol of Ireland, his love to Maud Gonne, mysticism, and nationalism. In the third chapter, Yeats’ ambivalence is analyzed based on “Easter 1916”. Yeats as an Anglo-Irish expressed his disillusion and scorn on the middle class who are obsessed with mammonism of Great Britain. He severely criticizs them compared with historical figures. He also criticized the spiritual downfall of Catholics. But “Easter 1916” shows Yeats''s change of attitude toward the middle class. The poem maintains objectivity based on historical facts and well expresses Yeats’ complicated emotion about the middle class. His ambivalent character can be seen through the fact that though, at fist, he respects the uprisings as martyrs, he expresses his sorry for the losses of many people’s lives caused by the incident. While Yeats appears to maintain his stance against the middle class with his despising and criticizing them, he also appears to return to the relationship with them in which he no longer despises them but exchanged nods with them. Considering all of these, his life itself creates the hybridity through continuous internal dilemma. The last chapter focuses on “Meditation in Time of Civil War” and analyzes his emotion and feeling in the course of the Anglo-Irish War. “Meditation in Time of Civil War” is made of the total seven sequences of poems, which shows about the ancestors and Yeats''s crisis of identity in relation with them. The poet feels a sense of alienation or fear of sacrifice in time of civil war. By using the opposing images as a tool for his complicated emotion, he tries to hold the coexistence of the past and current. During the first and second trimester, he seems to participate in the real politics and to keep distance from it at the same time. However, he becomes more interested in it in the last trimester. He shows his emotion against the Great Britain and resistance against to it with the participation in the real politics. Though there are limitations for Yeats as an Anglo-Irish, he seems to have tried to the decolonization of Ireland through his resistant poems which contains the postcolonial point of view. I believe, such poems which show Yeats’ hybridity will have strong influence on the composition of English poetry in the future.