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With the fast development of Web service technologies, we need workflow management system to assure a mass of different Web services to work cooperatively. In this paper, we propose a cooperative process-semantic repository based on probability, through which we could achieve automatic modeling of workflow according to custom's requirements in the Web service environment. Based on transfer probability, the components of the process-semantic repository and its self-adapting mechanism are also described. A prototype of e-travel system was then conceived, and applied in tourism. This e-travel system could automatically generate travel processes for the tourists. The efficiency analysis of the process-semantic repository is also done through some experiment data.