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In this paper we put forward a gird-based integration model (GBIM) for uniformly accessing heterogeneous database systems. In GBIM database operations are registered as grid services by different sites and a uniformly standard interface is provided to different users. In GBIM every database site is autonomous and its structure and position are transparent to users. GBIM makes use of GSI (grid security infrastructure) to shield database sites from unauthorized access and transmit data safely via Internet. GBIM is suitable and feasible for the large scale distributed heterogeneous database systems. The implementation of its prototype is also described.