Influence of adoptment of geocentric 3D coordinate system on Chinese existent maps

If a geocentric 3D coordinate system is adopted in China to replace 2D non-geocentric coordinate system, the coordinates of the surface points will be changed accordingly. The influences on the current maps of China, especially the topographic maps, are discussed due to the replacement of the coordinate systems. Taking the replacement of Xi'an 80 coordinate system by GRS80 for a numerical example, this paper analyzes the changes of latitude, longitude, gauss plane coordinates of the surface points, as well as the orientation and the length changes between the points on the map, including the changes of map border lines and sheet corner points.