This research puts emphasis on solving problems in digital heritage showing systems, including broken space information expression, complicated 3D scene arrangement, high mobile equipment processing requirements, and restricted cultural content depth. Taking one already finished immersive ancient cultural exhibition project as case research, we on system summarize system design ideas, development procedures, core technology realizations, and application results. By making use of Geographic Information Systems (GIS) which serves as spatial data infrastructure, this project has built an immersive heritage display platform that is compatible with mobile networks. It has realized the unified gathering of multi-source different-kind site data, coordinate registering, semantic marking, spatial database building, and virtual reality scene arrangement, hence forming an overall technical framework that includes data layers, service layers, application layers, and interaction layers. In the development process, important key stages contain: establishment of basic geographic information data bank for heritage places, high-accuracy three-dimensional rebuilding of core building constructions, making of historical renovation models, drawing of spatial index maps, lightening mobile VR picture rendering, multi-equipment adaptation, and multi-people cooperative interaction functions. Test outcomes prove that mean first-screen loading periods under Wi-Fi and 5G networks are still lower than 2.8 seconds and 3.4 seconds separately, hence key area scene changes are finished inside 1.6 seconds. Mobile devices can keep stable frame numbers which are above 42 fps, therefore VR terminals constantly get frame rates that exceed 58 fps. The user satisfaction metrics which include immersion quality, content comprehension and operational convenience have achieved 91.3 percent. The research results prove that this system has strong space expression abilities, working stability, and culture spreading effect, hence it hence provides a reusable technology frame for digital display projects of historical sites.
