1) Polyphonic expression is not only found in various folk songs, but also in musical instruments, such as the qibu'e, datitu, aqi xiele, hulusheng, etc. All of them are polyphonic. The polyphonic parts of folk songs almost always appear after the lead singer, and there are not only two or three parts, but also a four-part chorus. When the Lisu people in the Nujiang River area sing their folk songs, they often use the trill in the throat to moisten their voices, and this unique trill forms the unique singing style of Lisu folk songs. After 1950, music workers in the Lisu folk music collection, collation, research, based on the adaptation, created a number of works rich in ethnic characteristics, such as the song "Akeji", dance music "Pipa Song" and so on.