Abstract: Experiments of digital and analog mixed circuit are very important for students to learn the basic knowledge of circuit analysis and to improve their ability of practice, while the complexity and difficulty of these experiments is increased. Experiment boxes based on programmable system on chip(PSoC) platform include various digital and analog function modules, these modules decrease the difficulty of experiments and increase the diversity and interesting of experiments, thus most students can complete these experiments. This paper summarizes the principle for experiments design based on the PSoC platform, proposes two types of basic experiment model to use the principle in digital circuit experiment teaching, and then show the experimental process of digital control motor which is successfully completed by most students.