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Web services composition technology is promising technology to efficiently integrate heterogeneous, distributed and legacy software system. Performance becomes the key issue when Web services composition model complex and mission-critical application. The defect of design can result in the performance bottleneck problem in the running time. In this paper, we propose a simulation-based model for the business process defined by WS-BPEL. Our model takes advantage of general stochastic Petri Net to simulate the control flow and the transaction behavior of WS-BPEL through constructing the state transition space of composite Web service. Therefore, our simulation model can accurately obtain the performance prosperities with the smaller cost in contrast to building experimental system.