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Service oriented architecture (Service Oriented Architecture, SOA) is a new software architecture,which can guide us to consider about the application based on business .It can take new programs to complete the problem of the software reuse and software integration, making enterprises to build Flexible IT infrastructure,in order to win a real on-demand computing. As a guideline of application, it can be used through different technologies.The mainstream technology to the integrate heterogeneous systems is Web services, which is the realization technology of SOA.It takes SOA and opened standard protocol (XML, SOAP, WSDL, UDDI) to solve problems of the interoperability and communications issues among heterogeneous systems.SOA is the framework that use combination Web services to integrate legacy system. As the name is service oriented architecture, the whole system of services designed to help to complete the modeling.The essence of service is to make sure the separation of business and technology,it was beyond all of the specific technology, and includes all of the specific technology. Therefore, the design of services of the entire system is very important. However, the services division did not have a uniform standard, it is essential to rely on the experience of designers as well as the function of the system. From this we conclude that service is a significant part of the SOA architecture.First of all, based on the pivotal technology of SOA, we introduced and analyzed the core principles and technologies of Web services, and based on the actual demands of IT enterprises, analyzed the challenge for the traditional Web service. Also, we analyzed the implementation of SOA, namely Web service, which is needed by SOA for its platform-independent.Secondly, because the existing structure of SOA is not strongly adaptable, we put forward a semantic-based Web service from the services. By increasing and from the semantic description of Web services, find and publish Web services, so that this structure will support the discovery and release of the semantic-based service well.Finally, from the view of service design, we discussed the issue of services division of SOA-based Web services. Based on the standard of service division, we put forward the SOA-based Web services architecture, which, according to requirement, can deploy, assemble, and use the application groupware of incompact coupling granularity through network. By the construction of the management, which based on SOA and reliable test system, we completed the services modeling in part, and verify the feasibility of division. In this case, we divided the functional modules in line with operation flow to make system can response quickly on the changes of operation requirement. As a result, the platform will have a fine reusability and expansibility.
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