William Butler Yeats is a famous modern English lyric poet and playwright, winner of the 1923 Nobel Prize for Literature, and one of the leaders of the Irish Renaissance movement at the beginning of this century. He was the main representative of late Symbolist poetry in Britain and had a major influence on the development of modern British poetry. "Phantom" describes the development of human beings and history with poetic wisdom and imagination. This description has a certain continuity with the values ??and symbols of ancient wisdom. The book is mainly structured around the twenty-eight-eight-month phase. Each phase represents a different historical period, life stage, subjective degree, and personality type. Each phase has its own "will", "body of destiny", "creative mind" and "mask", as well as its own representative characters. Yeats believed that history develops in a spiral, from the apex to the periphery, and when the spiral develops to its maximum, it marks the end of an era. "Illusion" can also be said to be an expression of the latent structure of Yeats's poetry. It greatly enriches and deepens Yeats's feelings about the complex human experience, and gives his poetry an almost unsurpassable - and also An irresistible force.