As the oldest and most popular literary genre, poetry has produced countless works in the history of Chinese and foreign literature and formed various forms. There are many ways to classify poems, which can be classified from different angles. Generally speaking, according to the nature of the works and the way of shaping images, they can be divided into lyric poems and narrative poems; According to the historical development of poetry and whether the language has rhyme or not, it can be divided into metrical poetry and free verse.