With the development of geo spatial information technology, it is more important to build large scale virtual terrain scene with massive spatial data. However, in the face of massive terrain data, how to simplify terrain, improve rendering and rendering efficiency, is the key to the terrain rendering. After the research of the terrain rendering technology of LOD, the analysis and processing of large scale data sets, parallel computing and other related technologies, the parallel rendering technology of massive terrain data based on LOD is proposed. At first, quadtree LOD is used to simplified terrain, secondly it is combined with multi-core CPU parallel computing method to enhance efficiency, then it is combined with the large data scheduling strategy, finally it realizes the parallel rendering of massive terrain data, and it analyzes the non-parallel and parallel experiments under the same conditions. The theoretical and technical achievements in the research can provide a new idea for large scale scene rendering.