The emergence of the computers has brought great changes to all industries. The music industry is no exception. The rapid development of the computer music and especially the improvement of the quality of the soft sound make the cost of the computer music production greatly reduced. This brings the glad tidings not only to the music industry, but also to the opera music. The opera is a traditional form of art in China. It integrates music, dance, art, literature and performances and various artistic elements in one. Music is a very important part in the Chinese opera, which can render the environmental atmosphere, and make the spectators have rich imagination. But under the influence of the environment of today's society, the survival of most of the drama groups are very hard, not to mention their development. There is little investment on the bands, resulting in the loss of the excellent musicians. Although there are the good scripts and the good actors, the music has no expressive forces. Then the outstanding works are also difficult to achieve the ideal effect of the performance. This put forward a request on the opera groups: not only should they have the music of good expressive force, but they should also greatly reduce the costs of the music. The computer music is the best way to solve this problem. The flexibility of the computer music, the high clarity of the quality of the sound, and the richness of the tones and sounds, all have laid a good foundation for the social promotion of the opera music.