Through the analysis of An-lun Huang's ballet orchestra , this paper combs, summarizes and classifies the tonal materials existing in the works and discusses the combination of tonality and the storyline development of the works. Because the performance of this work is often accompanied by an important part of text recitation, it has an important impact on the overall musical atmosphere in rendering the story scene and depicting the characters' psychology. This article arranges the tonal arrangement to examine how tone expresses the literary contents of music and how well it combines with literature among the elements of music, and examines the distinct parts where the expressive power is maximized by the scale structure and transposition method. A tonality represents the major and minor along with the pitch. In fact major and minor are types of scales, So Modal scales and many other scales can be said a tonality. The church Modalscales are composed of 7 notes like major and minor, Major and minor also came from among the church Modal scales There are many similarities between the major and minor keys of the Church Modes. After judging the the Church Modes as major and minor, the characteristic sounds that are distinguished from the major and minor are explained as changing tones. But In the music after the ever-changing romantic music, an analysis using only major and minor keys may not be appropriate. Therefore, it can be said that all three aspects of tonal arrangement, scale structure, and transposition method are methods of tonal composition. First of all, carry on the tonality analysis. Then, the chapter after the tonal analysis will closely combine the development of the storyline, analyze the different overall touches brought by different tonal settings in different situations, and dig out a deeper connotation of the work. It is also hoped that through the analysis of this work, it can provide a certain reference value for the music creation of music works with strong story plot.