Abstract: The principle of moderation is the basic principle of artistic dialectics, which is of great value to all artistic activities. The art of singing performance not only requires the singer to have singing talent, systematic vocal music knowledge and constantly accumulated singing skills, but also needs to retain the control of the maintenance and application of breath, the enunciation and return of lyrics, emotional change and adjustment and other artistic elements with the principle of moderation. This article discusses these three aspects, so that methods and essentials can be mastered through repeated practice, so that being appropriate and being just perfect can be achieved in singing performance, and the ideal artistic effect can be obtained.