Abstract: The "three electricity" experimental course is an important basic practice course for electrical and automation majors. Based on the analysis of the shortcomings for the current "three electricity" experimental course teaching, this paper takes the teaching of the "three electricity" experimental course of the automation major of School of Electrical and Automation Engineering, Changshu Institute of Technology as an example, from the experimental content arrangement, experimental process arrangement, experimental teaching exploration and practice in teaching methods and evaluation methods of experimental results. The experiment content is arranged in the form of difficulty progressive and overall unit structure, and comprehensive, design and independent experimental projects are added. The management and assessment of the experimental process is strengthened, and clarify the management process and assessment content. The self-selected experimental project was added by adopting an independent open experiment mode. Adopt a multi-faceted and rationality of performance evaluation. The teaching practice shows that after teaching reform, the quality of experimental teaching can be significantly improved and the students' ability can be significantly improved.