As long as the rising of hydrological sites and it’s observation elements，the harder of dates integrated management，there is an urgent need for a new way of site management.Our research based on 3D GIS，under the supports of Internet of things/multisource date integration/VR，etc.set up a Ganzhou hydrological 3D virtual electric sand table system.It main includes construction of one map of hydrological station network/ check of the hydrological monitoring elements/ the view of 3d scenes/ hydrological analysis and simulation/rich media scene shows and so on.Practice shows，the system has modeling significance to the defense of Ganzhou hill-flood disaster/hydrological measuring and report/analyzing and making policy.