In the 18^th and 19^th century of English literature, there were two generations of English Romantic poetry in Britain, who have produced great influences on the literature world. Those romantic poets were inspired more or less by the French Revolution, and advocated to the people to pursue beauty and inner freedom in nature or art. The most extraordinary features found in their poems are the abundant Greek and Roman mythological figures. But two generations of romantic poetry have shown different purposes in employing the Greek and Roman mythology, which needs further reading and exploration. The present study centers on the comparison of characters preference in poems between the two generations and shed light on the critical difference in their purposes and impacts.