Different poetry formats are divided into the following forms according to different standards. According to the different contents and forms of expression, it can be divided into lyric poems, narrative poems and philosophical poems. According to different language formats, it can be divided into ballads, folk songs, nursery rhymes, rhymes, metrical poems and free verse. Poetry is a literary genre that expresses feelings and wishes. It is a literary genre with a certain rhythm and rhythm, which vividly expresses the author's rich emotions in highly concise language and reflects the social life in a concentrated way. "Preface to Mao Poetry" records: "Poets have aspirations. Have ambition in your heart and speak like a poem. " Yan Yu's Poems on Canglang in the Southern Song Dynasty said that "poets chant temperament". There is only one art expressed in words: poetry.