As the representative of "New York School", Frank O'hara played an important part in Postmodernism American poetry. However, the researches of frank O'hara dwell too much on his vanguand techniques and experimental language, ignoring the rich elements of social culture in his poetry. The essay studies the social and historical circumstances of O'hara's creation as well as the texts of his poetry thoroughly and deeply. In particular, the essay probes the complex and unique relationship between poetics and cluture in his poetry.