Abstract: Virtual reality technology is a kind of cross fusion of computer technology which is developed on the basis of multiple disciplines, such as computer graphics, sensor technology, computer simulation display. In this paper, according to the very few applications of the virtual reality technology in ancient cavern protection at present, take wedding festivities night ancient cavern of Yeren Caverns Scenic Spot of Shepan island of Zhejiang province with important cultural relics and tourism value as an example, to virtual reappear the ancient scene of wedding festivities night ancient cavern and the spatial environment existed in history. It provides the basis to the protection and development of the ancient caverns of wedding festivities night ancient cavern, and it's a beneficial attempt for the application of the virtual reality technology in ancient cavern protection.