With the development of GIS, intelligent management and networking, sharing the urban spatial information is becoming more and more important. This paper researches four important aspects of building the sharing platform of urban spatial information service, such as data organization, platform structure, application modes and key technologies used. Spatial data, as the dissemination vector of the spatial information, have a very important position in sharing the urban information services. In this paper, two main spatial data models are used to organize the required data. One is the multi-scale Pyramid model with sole element to deal with the vector data, the other is the tile Pyramid model to deal with the raster data. Taking into account the characteristics of the sharing platform such as multi-user, multi-demand, multi-purpose, and multi-functional, two modes namely Browser/Server (B/S) and Client/Server (C/S) are used to construct the entire sharing platform structure. The ultimate goal of building this sharing platform is to apply it in the urban construction to satisfy peoples' needs. So we must to select the suitable application mode. Finally, this paper introduces some key technologies used and the realized sharing platform of Tianjin urban spatial information service.
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