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Data Grid provides distributed resources for dealing with large-scale applications that generate huge volume data sets, while the Peer-to-Peer architecture provides the maximum autonomy and scalability. Combing their features, we have built a P2P Data Grid prototype as a high-available coordinated platform for storing, processing, and mining the massive Geospatial data. Replication strategy is the most challenging issue in building such systems, which includes the replica production, dissemination, location, selection, updating, synchronization and consistency maintaining. We exploit the replica production based on the spatial content, the replica dissemination based on DHT and directory, and the replica selection and maintenance problem in this paper.