By the research of Web service architecture, the article puts forward a new trust-based access control model, which is based on service-oriented architecture (SOA) and combines with service matching. The model puts the trust as matching criterion. Transaction is divided into three grades according to the level of trust. The different requests are matched appropriate services. That balances the network load, and improves resource utilization. In the model, LRU algorithm is used for the

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... t of service to improve the efficiency of the system. The article proposes a new trust calculation method, exponential smoothing is used for trust forecast, to further ensure the safety of service computing.