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With the rapid development of computer and network,and the widely application of Internet,it promotes the development of commercial application and the researches on science application under the network enviroment.With the requirement of high performance computing,the Grid technique is generated. As one important branch of the Grid technique,it offers users an integrated and intelligent platform which building on the existent infrastructure of Internet, protocols, Web and database technique, It’s purpose is to construct a next generation information platform and software infrastructure based on OS and Web.On this platform, information is dealed distributedly,collaboratively and intelligently,and the users can access information from single entrance.The ultimate aim is service on command and one click is enough.Because Grid span different management organization, its information is distributed and heterogeneous,in order to retrive information accurately,quickly and intelligently,and provide integrated information services to users, achieve integrated accessing of information , it requires an efficient information integration mechanism.This thesis aim at the problem,researchs the integrated accessing of information of Information Grid.In this paper, Firstly,it introduces the concept of Grid, Grid achitechture, characteristic of Grid, and analyzes the definition, research emphases of Information Grid and the aim of integrated accessing of information. Then it thoroughly research the technology of information representation, and propose a way of information connection based on Ontology, it uses XML/RDF to represents the syntax ,represents the semantics of information by Ontology. Lastly, after summarizing the technology of information integration, it proposes a technology of information integration based on middleware and information retrieval model based on ontologie, research the technology of integrated accessing of information.
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