Video projector is an indispensable multimedia teaching tool in modern classroom teaching. It can project the images of computers, mobile phones or other video playback devices onto a large screen, achieving large-scale visual display. In classroom teaching, video projectors can be used to play teaching videos, display PPT courseware, and conduct live streaming of online courses, greatly enriching teaching methods and forms of expression. It concretizes and visualizes abstract concepts, helps students understand teaching content more intuitively, and enhances learning interest and efficiency. In addition, video projectors can also be used for classroom interaction, such as student presentations, group discussions, etc., to enhance classroom participation and interactivity.