The important contribution of Yuefu Poetry Collection is to collect and classify the songs of past dynasties according to their tunes, so that many works can be written into books. This provides great convenience for the collation and research of Yuefu poems. For example, some excellent folk songs in the Han dynasty, such as Shang Mo Sang and Dongmenxing, can be found in Song Shu? Yue Zhi and Peacock Flying Southeast are found in Yu Tai Xin Yong, and some of them are scattered in books and other classics, which are collected and recorded by editors. In particular, some ancient folk songs and proverbs are generally found in various historical books, some academic works and miscellaneous songs, which are mostly ignored by the former. As for Du's later works, such as Old Proverbs, they are much later than this book, and they are obviously compiled on its basis. Mulan Poetry and Peacock Flying Southeast are collectively called Yuefu Shuangbi. Its arrangement is to put the "archaic poems" of each tune (poems written earlier by anonymous) or poems that appeared earlier in front, and the works of later generations are listed later, so that readers can understand that some literati poems are influenced by folk songs or previous generations of literati.