With the continuous development of enterprise informationCthe way that develop software First and then integrated Makes the system difficult to extend. This way of working will lead to secondary long development cycle, applications are not flexible, and can not take full advantage of existing IT assets. SOA has been fused developing and integrated, which diminishes the differences of various practical systems and realizes the EAI function with low cost as well as comprehensive systems. In this paper, foreign currency trading system is an example. We will discuss how to use Web Services technology to achieve service-oriented systems integration, Based on the guarantee of the optimized realization of different subsystem, they can be connected with each other, and meet the requirements of the corporation information and resources sharing in maximized level, so as to make the system highly expanding and Reusing.
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