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In order to ensure the correctness and reliability of Web services composition based on OWL-S, verify the interaction protocol of Web services. It is provided that three lay architecture. Composition service based on OWL-S, GA model is the middle model and the Promela model is the verification model, SPIN as a model validator. The OWL-S composition Web services transform a top-down conversation protocol process into a GA model, use WAST tool into Promela model, the SPIN tool analysis and verification structure and performance of composition services. This method is flexibility and scalability which provide a solution for Web services composition model verification.