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Based on multi-agent technology, this paper proposes a novel system infrastructure for context-aware system. We provide frameworks for communication and mobility. We suggest an agent model that integrates the software agents of the application with the hardware agents of the physical environment. We describe an integrated target tracking experiment, to demonstrate an implementation of this architecture. The infrastructure takes environment agent as the center, thus decoupling the relations of sensors with applications. It uses the sensors and evolution agents to do context sense and evolution. The management agents are used to realize security and privacy strategy, while the user and application agent are used to interactive with user and other applications.