Abstract: The quadtree algorithm is applied to separate the entire region of DEM data into static block，and construct TIN for various sub-blocks.By using VDPM，the simplified algorithm，it has simplified the creation of hierarchical model with different resolution from TIN.Then the quadtree algorithm is applied to establish an effective spatial index model to display dynamic scheduling.When the viewing position changes，the quadtree structure could be adjusted in real time in order to achieve real-time visualization of the terrain.Multi-resolution LOD algorithm can not only simplify the data，but also make the three-dimensional visual effects closer to the real terrain.

Key words: Multi-resolution LOD model, Quadtree, Three-dimensional visualization