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When a single Web information service can not match the needs of users, it is necessary to combine multiple Web services to meet the application. There are many methods about service composition in semantic Web, but the satisfying quality about matching speed and load balance has not been resolved. In this paper, the idea of decomposition about Web application was presented and a structure model of Agent was built according to the characteristics of Agent in Web. Focused on solving the matching speed and load balance, an Agent-based information service composition model was proposed, and an improved matching algorithm driven by Agent was also introduced in the strategy of the model.