Abstract: Combined with the problems existing in the traditional teaching, we have explored a new mode of hierarchical experimental for SCM principle teaching. Taking I/O interface experiments as examples, we have described the architecture of hierarchical teaching model, and told you how to teach students in accordance with their aptitude, how to promote their practice level orderly and stimulate their learning potential. At the same time, the hierarchical model will extend to all kinds of electronic design activity, and then the integrity and unity of SCM practice teaching system will be realized.