The vocal music teaching has being developing quite a time. However, it still uses oral teaching and inspiration of true understanding even today. With the development of modern science and technology, images of the voice can be processed so as to see the usage quality of the voice. As a result, visualized teaching methods are widely applied in modern education and teaching. Singing is a complex timbre. In vocal music teaching, through scientific instrument, the voice can be compared in a visualized way, which makes the invisible voice visualized. In this case, the vocal music teaching changes from the traditional model to a combination way with "mouth, ears and eyes".