Since the early 1950s, Charles Olson(1910~1970) had used the term "postmodern", "post-humanist" and "post-historic" along with "post-Darwinian" or "post-essential". By the "postmodern", what does Charles Olson mean? This essay discusses Olson`s postmodernism, looking in particular at its political implications. Previous readings of Olson, which have been concerned primarily with his "literary" achievements, especially with "projectivism", often leave the political implications out of their analysis. Yet, during the 1950s and the 1960s, Olson proposed his postmodernism not only to criticize high modernists` poetry but to deconstruct U. S. Empire`s expansionist imperialist culture after the second World War. According to him, from post-Socratic Greece to post-war America the West had exploited the Other through its anthropo-centric and logo-centric world-view. Olson intended his postmodernism to be a "cultural revolution" to overturn the West`s imperialist world-view.