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The authentication of web service combination is the key to ensure the normal working of the combination service. Many methods of current web service combination are half-formalization, which can come out many errors and not easy to be detected, so the correctness is hard to be ensured. The paper introduces the Transfer matrix to analyze the deadlock problem in web service combination, and adopt Incidence matrix to ensure the accessibility of combination. Fuzzy Reasoning Petri net is the reasoning method of formalization authentication, which can achieve the credibility authentication, credibility and accessibility of the service combination. The result of the experiment show the method is an good authentication method.