The significances of modernism lie in the different viewpoints of the individual, the different ways of imagination , and the pursuits of different structuring of forms. The rise and vitalization of Taiwan's modernist literary movement, which greatly inspired the writers' minds and then turned into a literary trend in literature, started with the formation of Chi-Hsüan's "School of Modernist Literature" on 1956. By the 1970s, Taiwanese intellectuals' debates on modernist poetry and on nativist literature had come to an end, with the result that the modernist literary movement was slightly declined. In other words, the explosion of western modernism, which presented different literary theories and trends in one hundred years, could be seen in the progression of compressing and overlapping different literary theories and trends in 25 years of Taiwanese modernist literature between 1956-1980. If we compare such a progression with the abundant publications of Bai-Chiu's poetry and poetic theory in these twenty-five years, we are able to see the total match, which indicates Bai-Chiu as a witness of the development of Taiwanese modernism. This paper is to examine Bai-Chiu's poetic works through a viewpoint of "alienation," and analyze the experimental formalism and the language of expressionism utilized in his poetry, which presents Bai-Chiu as the one poet, who alone believed in symbolism as well as existentialism that explains the strong anxiety of Bai-Chiu's poetry and the inland Taiwan