Abstract: The development of information management system of dams based on WebGIS is discussed, analyzing thoroughly the characteristic and the structure of spatial and attribute data of dams over 30 meters. The modern information techniques of network, database and GIS are applied in this system. The attribute data of 4681 dams over 30 meters are provided by Chinese National Committee on Large Dams. The spatial data are registered based on 1:1,000,000 fundamental geographic information. The code of large dam data, construction of database and design of map layers are finished. Then the WebGIS system of spatial dam information query and share service is structured. The informatization level of dam information management and share service ability of dam information are increased greatly in China. Key words: WebGIS; dam; information management system; spatial data; information sharing 1
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