Marine geographic information system is advanced stage in GIS application, which is embedded in dynamic numerical simulation. Intuitively, it is an import method for analyzing features or changes in marine environment to show numerical simulation results with graphic images. Based on a Web GIS application platform,the application of Java2D graphic processing technique and ArcGIS JavaScript API achieves, with coupled hydrodynamic numerical model, dynamic creation, intelligent drawing and superimposed revealing with relief maps of the figures which are given by numerical simulation calculation.