strength, like other elements in music, is very important in music performance and should not be ignored. The strength of music is closely related to the content of music. For example, lullabies are always sung or played in a light voice, and the content of such music is contradictory to the strong voice; However, grand, victorious and combative music needs to be sung or played with strong voice, and the content of this kind of music is far from the light voice. Using the change of strength, we can also get a sharp contrast between strength and weakness, so as to effectively shape the music image.