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The software systems grow rapidly with the development of software technologies. Traditional Enterprise Application Integration technology can not adapt to the rapid increase in the Enterprise Information Systems. In SOA, different development tools can interact with each other to realize integration. With standard protocol, Web can integrate all kinds of heterogeneous system into current system conveniently and quickly, especially provide a high-quality and low-cost solution to enterprise application integration. Using SOA technology to realize EAI will resolve all sorts of shortage in EAI technology among distributed different- structure systems, moreover it makes the integration of application programs faster, easier and more effective than before. This paper introduces the integration of enterprise application, then analyzing the architectures and key technologies of SOA, propose a SOA-based solution to the integration of enterprise application realized via J2EE.