Jo su-mi is one of the world famous soprano vocalists. Since her youth, she has shown her outstanding talents in music and she has won six international competitions for the first time in the Orient and recorded performances in the world's top five opera theaters. The voice refers to the sound waves generated by the air released from the lungs through the saints, and as the body ages, the voices become low because the whole body of the human body is generated in a sieve. This phenomenon is a fatal phenomenon for soprano vocalists who play the highest of female vocalists, so soprano vocalists generally have a short life span. However, comparing the song voice of the debut song with the song voice of the past 30 years, it can be confirmed that it does not become low and remains the same. In this paper, to analyze the reasons why Jo Su-mi is loved globally, this paper focuses on vibration, duration, treble, and technique that are typical characteristics of Jo su-mi singing voice. As a result, it was confirmed that the region of "Koloratura" of 1000Hz or more appears with a definite sound value while maintaining a constant vibration. Finally, it was confirmed that the sudden change of the tone freely appears in a short time, while maintaining a deep vibration.Thus, it is possible to identify the objective voice based on the sound engineering knowledge of the singing voice of the singer Jo Sung-mi, which has been evaluated by the critics until now only subjective and abstractly.