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Introduced method that used multi-layer open grid services architecture (OGSA) to construct grid-based fault diagnosis expert system (GFDES) based on multi-model. Designed the grid service layer based on OGSA, and developed the programs of public service and parallel service in the server. Formulated data grid market-based architecture (DGMA) was made up of independent distributed grid nodes, corresponding to a faults diagnosis expert system. The data transfer adopted grid FTP and was implemented through the API functions provided by Java cog kit.