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With the development of Web Service composition, more and more diversified and complex business demands are satisfied. But the logical validity cannot be guaranteed. After a short view of recent research efforts of formal modeling and verification about Web Service, this paper proposes a new formal model for WS-BPEL described Web Service composition. The specification language of the model is LOTOS. Model checking is adopted to ensure the validity of this model. Finally, an example is presented to illustrate the practicality of the model.