Audio-visual data of minority nationalities' music is related to music notation, music theory and voice department as well as other music historical materials. It is an important part of China's outstanding traditional culture. Since the reform and opening up, integrated editing campaign of folk music including ethic music has got scholars save a lot of precious music audio-visual data during the process of collecting and organizing. From the historical perspective, the ethnic music's notation, variety and forms of voice department as well as its cultural connotation, mode of existence and its exploration value shown at present have become the main manifestation of historical value. This paper probes into the historical value of the sound and images of the minority nationalities' music in our country, mainly from studying the following factors:the music notation, music variety and the form of voice department of the ethnic music.