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Web services solve the problem of inter-organization business integration and are under a distributed, dynamic, autonomic and heterogeneous environment. The correctness and verification of Web service orchestration is important. Formalization is a valid method. This paper gives the model of Web service orchestration based on concurrent transaction logic. An introduction of Web service orchestration and concurrent transaction logic is given. Then the translation rules from WS-BPEL to concurrent transaction logic are given. The verification problem o Web service orchestration based on concurrent transaction logic is discussed. Finally, an actual Web service orchestration example based on concurrent transaction logic is illustrated.