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Service-oriented Architecture (SOA) is one method to integrate and construct loose-coupling software systems. It turns the distributed enterprise applications and new systems into software service on Internet. Traditional enterprise application integrating (EAI) method cannot meet the requirements of operation flexibility, extensibility and loose-coupling integration. This paper proposes the function model of one service-oriented EAI platform (UAP) and its realization mechanism. By turning existing enterprise applications into one integrated system and distributing the services, UAP has provided one SOA based integrating platform for enterprise applications. The above model is implemented and validated in a J2EE application server to integrate the application systems of one group company. The experiments show that the model manifests high operation flexibility, scalability, loose-coupling character and low integrating workload.