The purpose of this article is to explain the systems, patterns, and voices of Southern Qu's opera writings in the Song and Yuan dynasties. In terms of systems, it begins with subject, overture, and stage of performance. As to patterns, three aspects are investigated, including tunes of Kung, tunes of Qu, and set numbers. The ways of singing are divided into solo, relay, relay ensemble, and chorus. Research findings are as follows: opera writings are ancient voices of legend, and its origins and heritages are continuously carried forward. For examples, tunes of Qu inherit from ancient Qu and pass on to legend; sets of forms of opera writings inherit from forms such as Drum Ci, Chan Da, Long Qu, and Chan Lin, and then pass on to legend for their evolution and development; set numbers of opera writings are affected by Northern Qu and eventually become ”set of form”. The so-called ”latter generations turn into the top class” is an unavoidable trend, while the variety of voices is also a destined path for opera art.