1. Extend in singing activities. For all kinds of songs, lyrics and songs are the most basic elements. If you want to sing a song skillfully, you must master the lyrics and songs in all directions and practice more. In music class, children can master the lyrics, understand the melody and practice this kind of songs with the help of expanding activities. Application of extension in prosodic activities II. For rhythmic activities, it mainly includes three contents, one is to master various movements, the other is to feel music, and the third is to perform harmoniously. Under this premise, teachers can guide children to express their body movements more creatively. Therefore, teachers can construct the corresponding musical situation for children and extend this situation.