The digitalization of cultural relics can not only record the status quo of cultural relics in a salvageable manner, but also realize the transformation of cultural relics resources from material resources to digital resources, laying a foundation for immovable cultural relics and the cultural information they carry to the public in the digital era, to participate in education and value construction, and to participate in the mutual learning of civilizations in the world. By studying the application of 3D laser scanning and virtual reality technology in the digitalization and virtual display of immovable cultural relics protection, and taking Cave 96 of Mogao Grottoes in Dunhuang as an example, the scientific nature, rationality and operability of the technical routes and methods formed were verified. The results prove that the results can provide reference for other immovable cultural relics protection digitization and virtual display.