Orff's music education system is one of the three most famous and influential music education systems in the world today. Especially in recent years, it has been rapidly and widely popularized in kindergarten music education, forming a set of more effective teaching means and methods in kindergarten music teaching. Therefore, I try to use Orff's music teaching method to improve the music classroom of pre-school education in secondary vocational schools, and deal with the music theory knowledge in the existing music textbooks, that is, the impractical knowledge is only used as the basic knowledge of understanding and practical, especially the common sense in kindergarten music teaching practice. I divide it into four basic modules: notation, rhythm, interval chord and mode tonality. Taking the second module as an example, the application of rhythm is of great significance. Music teaching, body rhythm and musical sense training in kindergartens are inseparable from rhythm. According to the characteristics of Orff's teaching method, I set the module into several parts, including: basic rhythm training, special rhythm training, momentum training of body instruments, body rhythm, self-made percussion instruments, percussion instruments commonly used in kindergartens, simulation classes and so on. Among them, the simulation class is a demonstration of kindergarten rhythm teaching for students who are about to practice, which makes students have an intuitive understanding of the current kindergarten music teaching and has received good results.