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This paper presents the shared interface gateway software model based on the project of CWPS(Cooperative Workflow Platform Service). Firstly, the shared interface gateway framework is built and the meta-models of shared interface gateway software are given using BNF. Then, the protocol configuration model is designed using strategy structure pattern and its class diagram is given using UML. The content format of the configured protocol is defined using IDL and the description of content of configured protocol is given using xml. Finally, the implementation of communication semantic is discussed and asynchronous communication is implemented. Experimental results show that the proposed software model can make effective use of resources and achieve high performance.