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With the rapid development of digital city, the urban geographical data (geodata) are accumulated and updated constantly, and the development of Web GIS at its full speed makes geodata on the network more and more abundant. But most of the present GIS systems are isolated and can not communicate and cooperate with each other. To solve this problem, the solution of Web service of urban geodata based on XML is put forward in this paper to the sharing and interoperation of isomerous distributed geodata. The Web service mechanism can be used in ITS for the management of traffic information such as road networks in different areas by integrating them into the same platform and operation system, thus providing the visualization of traffic information and synthetical traffic information services. The paper discusses in theory the key of sharing and interoperation of geodata and presents the service model of combination of metadata and geodata by designing the whole scheme of Web service of urban geographical data based on XML. On the basis of designing, application instances of Web GIS are provided in this paper by setting up several Web services of geodata on surveying and city-planning in Shanghai, China. The paper prospects the development of Web service of geodata in the end
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