Advantages of audio-visual method: 1 Audio-visual teaching materials can be reused to better adapt to students' individual differences and different levels of requirements. 2. The content of the textbook is close to the actual situation, which is easy for trainers to understand by feeling, and vivid images are easier to cause.

Students' interests. 3. Audio-visual training enables the trainees to get consistent guidance, so that the project content will not be affected by the trainees' interests and goals. 4. Recording students' reactions will enable them to watch their live performances without the need for explanations from trainers, and students cannot blame the poor performance on the bias of external evaluators.

Disadvantages of audio-visual method: 1, more advanced audio-visual equipment costs more. 2. It is not easy to produce targeted audio-visual materials consistent with the training content.