To satisfy the requirements of enterprises in different developing phases,always use the latest technology, that lead to existing many software and various hardware,operating system,middleware,programming languages,data storage,reusable redundant code in the enterprise and they can not directly communicate,as many "information islands". However,different application systems distributed among the different departments in the enterprise,when new business requirement appear and it can not be integrated with business processes across the whole enterprise. Enterprise often give up the old system,and develop new applications based on the new requirement, that will simply unable to respond to changing customer and market needs to make an effective coping strategies. An frame solution to integrate new application with the extant systems in enterprises based on SOA is proposed in this paper.that will help to solve the enterprise's extant IT systems can not flexibly respond to problems of business process change.
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