smart board free trial.The third is that we want to turn some abstract things into concrete ones. If we can show some problems with ordinary PPT, in fact, the electronic whiteboards are more abundant, more diverse and more diverse. The fourth is the students I have implemented to improve the efficiency of teaching and enhance the teaching effect. The fifth is to improve students' attention. This is our headache. In our vocational school, in my school, the biggest problem we reflected in the previous two years is that the students?? attention is not concentrated. Why do we want Set the class for 40 minutes or 45 minutes, which is from the time of our students' attention, and can be maintained between 30 and 50 minutes through a lot of scientific analysis. This kind of control for our students is not very strong, because his own learning foundation is very poor. So when I am studying now, I like to take out my mobile phone or do other things. The attention is not very concentrated. If you use an electronic whiteboard, you can concentrate on this, and your attention will increase quickly. The second one can record the entire teaching record in the middle of the whiteboard. Before, there was a friend who also did some work in this area, such as an e-book bag or a cloud classroom. They found that the ability of students to accept after a class was limited. How to make him achieve better results outside the classroom, you can play it through playback. It is equivalent to reading it after I have done a wonderful show on the TV set, and he can be more familiar in time.