本文主要研究阉人歌手的兴衰及阉人歌唱对美声唱法的影响。以先阉人歌唱时期开头，主要介绍了格里高利圣咏和复调作品对欧洲声乐最终发展到以阉人歌唱为“黄金时代”的美声唱法这一历史进程的贡献和阉人歌手的产生。进入阉人歌唱时期，介绍了最具代表性的声乐教育家和阉人歌手。接着，笔者从歌剧发展的角度论述了阉人歌唱艺术兴衰之由并对此做了不同以往的思考。全文多注重以史料为基础归纳和总结阉人歌唱艺术的发展历程，并由此理出了一条美声唱法的形成过程以及阉人歌手在此过程中所起的作用和对后世歌者的影响。文章近尾处涉及到了上男高音的研究，对其与阉人歌手的关系依然以史料为基础进行了思考。

English Abstract: This paper studies the rise and fall of eunuchs and eunuch singers of bel canto singing impact. First eunuch to sing at the beginning of the period, mainly introduced the Gregorian chant and polyphonic vocal works for the eventual development of Europe to a eunuch singing the "golden age" of Bel Canto's contribution to this historical process and the emergence of eunuch singers. Eunuch singing into the period, introduced the most representative vocal music educators and singers eunuch. Then, the author from the perspective of the development of opera on the rise and fall of the art of singing eunuchs and have done from the past, thinking different. The full text of more than focus on the basis of historical data and summarize the eunuch singing into the development process of art, and thus sort out the formation of a bel canto singer eunuch process and in the process the role and impact of generations of singers. Near the end of the article relates to the Office of Research on the tenor of their relationship with the eunuch singer still a history-based thinking.