Yuefu is a music institution established in the Qin and Han Dynasties. It flourished during the reign of Emperor Wu of the Han Dynasty, with the largest number of musicians reaching more than 1,. Yuefu's task is to collect folk songs on a large scale. Musicians in Yuefu not only process, adapt, create and fill in the lyrics of folk songs, but also study theory, singing and performance. There are also excellent musicians in Yuefu, such as Li Yannian, the captain of Xielv in Han Dynasty. He is good at singing and writing, and he is very appreciated by Emperor Wu of Han Dynasty. He created "Twenty-eight Solutions of New Sounds" according to the music of western regions, which is the earliest record of absorbing the essence of western regions. In the 7th year BC, Emperor Ai of Han Dynasty stopped Yuefu, which made Yuefu decline from prosperity. The emergence of Yuefu played a role in preserving folk music, promoted the prosperity of folk music in Han Dynasty, and had a far-reaching impact on the development of music culture afterwards.