With the rapid progress of the digitalization of the performing arts industry, audio-visual technology has become an important support for performance creation and display, which has a decisive effect on the artistic expression of performances and the audience experience. In this article, we will discuss how audio-visual technology is used on stage. Starting from the concept and type of audio-visual technology, it elaborates on the advantages of its application. Then, it puts forward some specific application and operation methods for sound optimization, visual effect creation, online and offline live broadcasts, rebroadcasts, and immersive scene construction, etc., in order to provide more practical references for the technological integration and development of the performing arts industry.