In service-oriented computing networks

it is urgently needed to objectively evaluate service entity's QoS.In previous studies

service entity's QoS is only a weighted QoS that is perceived by users.It cannot objectively reflect the QoS that the service entity can provide in actual network environment.Combined with the actual service composition environment of service entities to characterize QoS of the service entity

a policy for the trusted QoS evaluation and service selection with environment aware is proposed:(1) the QoS of service entity is characterized with different load QoS feature vectors;(2) a trust reasoning and evolution mechanism subjected to trusty entity is established to effectively avoid the shortage of creditable generalization in the trust evolution mechanism;(3) the creditability of service entities and QoS feature vector are deduced based on service entities through the trust evolution;(4) combined with the current service load

a more objective evaluation of QoS that service entities actually provide is obtained.Finally

an integrated trusted QoS evaluation and service selection algorithm is given.Experimental results demonstrate the effectiveness of the policy.