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Along with the development of Internet, Geoinformation Sharing and Open GIS are of increasing importance for GIS application fields. Spatial Information Grid (SIG) is the fundamental application of Grid technology in spatial information application service domain. This paper presents a pilot platform for Resource and Environment Geo-information Sharing for Southwestern China based on Web Services, .NET, OGC, Web GIS and SIG is constructed. The architecture in the pilot platform consists of 3 tiers: application layer, service layer and resource layer. Via the pilot platform, distributed heterogeneous geo-information, software and hardware resource from four provinces and one municipality in Southwestern China is integrated.