The forms of Yuefu poems are three words, four words, five words, six words and miscellaneous words, among which the most commonly used ones are new miscellaneous words and five-word poems. The folk songs of Han Yuefu have no fixed rules and syntax, and the length is arbitrary, so there is no need to write a case.
The poems collected by Yuefu were later called Yuefu Poetry, or simply Yuefu Poetry, which is a new poetic style after The Book of Songs and Songs of the South.