Most computer science courses are based on multimedia teaching method. The essence of multimedia-based teaching is displaying the content of teaching in a more intuitive way, so that students can accept more easily and produce more profound memories.

The first method is broadcasting the screen recording to all students, and then they do the experiment through their memories. The inadequacy of this method is that students can only see but can not follow the operation. It is very difficult for students to remind the processing steps when they do it alone. In the experiment, teachers have to guide students in individual counseling, repeating the operation so many times. It is inevitable that guidance teacher can not take care of all the students. It is a waste of teachers’ work. The class time is so limited that teachers can not solve all the operational problems for students, thus affecting the effectiveness and the progress of teaching.

Second, teachers do not have pay attention on screen, and it is free to set up suspensions in recording. That avoids confusion in the process of presentation, and the phenomenon of disruption because of the operational errors or system failures. It ensures the progress of the course.

Third, CAI classrooms do not have to have all the software applications installed. It makes the machine easy to maintain and it does not reduce the performance of the machine.