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Yuefu poetry consists of two parts: one part is written by feudal noble literati to praise the merits of the emperor and pray for longevity. The content is empty, the form is dull and the value is not great. The other is the songs collected from the people, which mostly reflect the social reality at that time and express the thoughts and feelings of working people's lives. They are free in form, vivid in language, concise and concise, using a variety of expression techniques, combining narration with lyricism, and achieving high artistic achievements! This is the essence of Yuefu poetry. Folk songs in Yuefu poems inherited the realism of The Book of Songs and had a far-reaching influence on later literature. For example, during the Jian 'an period, literati wrote current events with old Yuefu poems, which gradually produced the character of Jian 'an. Especially the new Yuefu movement advocated by Bai Juyi and others is directly related to the influence of Yuefu folk songs.