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With the rapid development of Internet technology today, B2B e-commerce quickly grows up. Enterprises only have their own business system, is unable to meet the rapidly changing business needs, which bring by corporate merger acquisition and fierce competition. Enterprises must be able to face to the market quickly, find a better approach of information systems integration, so that suppliers and partners are more effective collaboration through the network. SOA including the protocols and standards are a new distributed scheme. The goal of SOA is to provide a common technology layer, which is independent upon languages and platforms. The applications of different platforms need this technology layer to connect and integrate with each other. SOA technology is used in e-commerce can be good to meet these needs. In the network era, B2B e-commerce is developing continuously. Although most of the corporations have accomplished the informational- action, they always are independently. How to integrate the systems of several corporations and use the B2B e-commerce systems synthetically becomes the most important problem. With the change from developing a new system to using existing systems adequately, the service-oriented architecture becomes the best way to satisfy the new demand. SOA can increase reusability, reduce the total cost, Therefore, SOA has become an effective method to solve application integration. This paper provides first an overview of the B2B e-commerce, then a brief introduction of the key SOA technologies, and final a scheme of using SOA technologies to construct a B2B e-commerce model on the J2EE platform.