This paper discusses the application of the online and offline mixed teaching model based on the first song practice platform and the BOPPPS teaching model in the computer composition principle experiment. The core concept of this model is to design the teaching process of the computer composition principle experiment based on the six key modules of BOPPPS with students as the leader and teachers as the guides. Through this model, an all-round, multi-level and multi dimensional teaching model can be established, and a monitoring system can be equipped to improve students ability to solve complex problems and deepen their understanding of computers.Practice has proved that the new online and offline mixed teaching mode using the first song practice platform and the BOPPPS model can effectively achieve the expected educational goals.