To overcome difficulties in processing and implement the ultra-high resolution GIS map information display, technologies such as cluster parallel processing, WMS services, GIS rendering etc are researched in this paper. A cluster-based GIS tiled display system is presented. Parallel WMS access technology is used to get GIS data, projection transformation is discussed to process map data. And OpenGL texture rendering method is researched to parallel display. Thus, ultra-high resolution GIS data is displayed on the tiled screen. The experimental results show that the cluster-based GIS tiled display system presented is feasible and can greatly improve the display resolution of map.