Abstract: With the emergence of Web service，trust，among service providers，service requesters and proxies，is an important thing for security and reliability of software services and combination of services.This paper gives the definition of the trust and reputation，and the differences between them，then puts up a valuation model of trust and reputation—Web Services Trust and Reputaion（WSTR）.It gives the more flexible method that valuates the trust degree and can more express the combination of the subjectivity and objectivity of trust to put the reputation concept into the synthesis of recommendatory trust and uses existing nodes as entities of saving reputation.Reputation can reflect the true reality of the situation through analyzing the result of the simulation.

摘要： 随着Web服务的出现，对软件服务和服务组合的安全可靠的运行使得服务提供方、服务请求方以及代理之间的相互信任变得尤为重要。首先给出信任和声誉的定义以及它们之间的区别和联系，由此提出一个用于度量软件服务间信任关系的信誉评估模型——WSTR。给出了更加灵活的计算直接信任度方法，并且将声誉引入推荐信任的合成中，利用现有的节点作为声誉存储实体，更加能够体现信任的主观性和客观性的结合。仿真结果表明声誉度能够客观地反映出真实的实际情况。