In terms of the issues of slow data scheduling and low scene rendering efficiency in traditional 3D visualization technology, a dual-thread data scheduling strategy with parallel rendering threads and scheduling threads is proposed in this paper. The data was transferred into the waiting queue by this strategy, the vertex hierarchy was divided according to the view distance, and then the scene was drawn using the dual-thread rendering pipeline. In order to improve the processing speed of 3D scene, a second-level cache rendering mechanism and tile data update strategy were established, combined with Cesium graphics engine, a three-dimensional visualization system was designed and developed for Wuyishan National Park, and the performance of 3D scene rendering and data scheduling are optimized, meanwhile the multi-source data integration of the national park is realized. The ability of three-dimensional display and interaction in virtual scenes between cross-platform and cross-terminal are improved, it is provided as the industry reference for the digital construction of national parks.