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The sharing and interoperability of geospatial data are important issues for spatial information grid (SIG). Based on an existing SIG platform, we tentatively propose a three-level overview SIG layout. Within this new architecture, some grid service entities (GSEs) complying with Open GIS Consortium (OGC) interoperability specifications, such as Web Map Service (WMS), Web Feature Service and Web Coverage Service, are implemented to solve the challenge mentioned above. We focus on explaining the characteristics of the new architecture and on implementation of the OGC GSE utilizing MapServer. A WMS GSE application example with satisfactory results is also presented.