Nowadays, under the background of information development, information technology has been widely used, multimedia computers are changing with each passing day, and multimedia functions are becoming more and more powerful. Multimedia is getting closer and closer to my life, which is of great help to my life and work. CAI is a new modern teaching method, and it has been well applied in other scientific fields. In the field of automatic control, Cai Wei, who is also a text multimedia, has developed for such plans as "detection". Therefore, it is necessary to develop such a courseware for computer-aided teaching. PowerPoint is a software for electronic demonstration. It can make a text multimedia work, but it can also make some simple animations. In projectors or computer monitors, it can be used in a wider range of fields. This multimedia courseware can fully mobilize students' active participation and significantly improve the quality and efficiency of the demonstration and students' enthusiasm for the course. Keywords: detection technology PowerPoint CAI