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Commercial banks have paid more and more attention to the development of intermediary business, traditional intermediary business systems mostly adopt traditional client/server with two layers structure. This architecture suffers the following disadvantages: overload of client and server, poor scalability, difficulties in cross-platform and maintaining. The three-tier architecture based on the middleware tuxedo is introduced into intermediary business. The development methods based on middleware is described firstly. As an example of social insurance intermediary business, the business requirements and workflow are analyzed. Using data dependent routing and two-phase commit protocol, the system performance is optimized. The communication protocol and service dispatching method are proposed to achieve interaction with legacy systems. Finally, its efficiency has been proved by an example.