With the rapid development of information technology, such as high speed, large capacity, digitalization, integration and individuation, the communication between people becomes more convenient. With the wide application of information technology in education, teachers can not only rely on a mouth, a piece of chalk and a blackboard to teach as before, but must use multi-media technology, multimedia and computer network, and the use of slides, projection, recording, video and other audio-visual teaching facilities to carry out teaching.