Seven-character poem is a form of seven-character poem with seven words in each sentence. It occupies an important position in China ancient literature, and is widely used to express ideas, express emotions and describe scenery. The seven laws require a fixed number of words in each sentence, rigorous structure and neat rhyme, which can show the poet's talent and artistic expression ability. The seven forms of rhythm restrict the expression of the poet, and also endow the poem with unique rhythmic beauty and sense of rhythm. The Seven Rhymes occupies an important position in China's classical poetry and is regarded as one of the traditional artistic forms of literati.