Abstract: Combining the marine geological information together with the marine basic data and remote sensing data, we adopted the B/S structure to realize the organization, distribution and application of Skyline-based marine geological Web GIS system. This system has laid a solid foundation for the realization of a three-dimensional geographic information system for marine geology. A detailed description of the Skyline software and its application to marine geology GIS is made in this paper with emphasis on the three-dimensional scene modeling, B/S structure web visualization and system function design.