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Spatial Information Grid (SIG) is the fundamental structure of share and interoperation with geospatial. Several SIG reference specifications have been constituted by ISO and OGC to provide standard interfaces. This paper pays attention to construct and implement SIG's resource layer, which is the most important part, studies its conception structure and required functions. A SIG data service node is designed based on OGC and NWGISS. Three different access modes are employed to test the availability of this node. Experimental results demonstrate this service node can successfully respond to standard OGC requests and returns specific spatial data in different network environment, also shows a good capability of sharing data under isomerous operation environment.