This paper selects mainland China as the research area, studies the development status of children's musicals in the region, and puts forward five problems in the development of children's musicals in mainland China: First, the development level of children's musical shows regional, and the development field is unbalanced. Second,The creators of children's musicals who know drama don't know music, and those who know music don't know drama. Third, the creators do not have enough knowledge about children's development, so the works created do not meet children's unique requirements.