Guangxi Sanjiang Dong ethnic group's big song is mainly spread in the Dong villages along the Rongjiang River in Meilin, Fulu and Yangxi townships of Sanjiang County and the Dong villages in Luocheng. Sanjiang big song is usually sung by male and female singing teams sitting in the drum tower or around the fire pit during festivals to tell the philosophy of life and impart knowledge of production and life. According to the timbre, Sanjiang Dong ethnic group's big song can be divided into male big song, female big song, children's big song and male and female mixed big song. According to the genre, it can be divided into 7 types: drum tower big song ("Gadelou"), voice big song ("Gasuo"), children's big song ("Galawen"), narrative big song ("Gajin" and "Gajin"), ritual big song, opera big song and mixed big song ("Gasinisuo"). There are hundreds of main singing styles, and representative works include "Ga Gaosheng" (mountain song), "Neng Men Gaojing" (mountain well water song), "Ga Lun Lian" (cicada song), "Ga Yiyo" (cicada song), etc. The Dong people have no written language, and the big songs are all taught orally by "Sangga" (singer), and passed down from generation to generation. The big song style has a unique structure, and each song consists of three parts: "song head", "song body" and "song end". The voice part of the big song is usually two-part. In the folk, it is known as "male voice" (high voice) and "female voice" (low voice). Sanjiang Dong big song is rich in content, diverse in variety, and beautiful and pleasant in melody. It is known as the "most beautiful natural sound" in the world. With the continuous development of reform and opening up and the market economy, the Dong big song is facing the risk of being lost. Protecting and inheriting the Dong big song can play an important role in promoting the cultural construction of the Dong area and building a harmonious society.