The development, popularization and application of Digital Geological Mapping System are organized by China Geological Survey. It has been widely used in national geological survey since 2004. Now digital mapping system is still in research and development.Digital regional geological mapping system is the software for whole process of regional geological mapping survey. The functions of this software include the navigation and positioning of BEIDOU and GPS, electronic compass measure, sketch compiling, the field data captured from geological route observation, practical measured profile, geochemical rock survey, geochemical soil survey, geochemical stream sediment survey and heavy placer survey,as well as making geological map, 3D geological map modeling and spatial geological map database establishing.Base on the logical data layer model, the technology of data stream \