Abstract: In 1950s, American Beat poetry was characterized by intense Zen Buddhism, which was reflected in the works written by Allen Ginsberg, Gary Snyder and Kenneth Rexroth, who have been regarded as the main representatives of the Beat Generation. The three poets transformed the mysterious experience in their Zen practice into poetry to express escaping from the reality, ecological philosophy or eternal emptiness (Sunya), all of which are the essense of Zen Buddhism.