Abstract: Service selection is of crucial importance for the sharing, composition and reuse of services. With rapid growth of the number of candidate services which have same functional attributes but have different non-functional attributes, e. g. quality of service(QoS)，QoS has been regarded as one of the most important criteria for the selection of services. However, the authenticity and trustworthiness of QoS data can not be effectively guaranteed during service selection process in dynamic network environments. To address this problem, trust of service (hoS) including the trust of service resource type and the trust of service provider was introduced. Trust mechanism was therefore established for service selection through the evaluation of two kinds of trust. Association relationship between QoS and ToS was given with the employment of dominance relationship and projection model in Skyline technology. A skylincbased dynamic service se- lection algorithm was proposed to improve the trustworthiness of service selection while QoS requirements arc already met. Simulation results demonstrate the feasibility and effectiveness of the presented algorithm.

Key words: Scrvicc, Service selection, Trust