网格环境中的信任问题是网格计算发展过程中必须解决的一个重要问题。网格实体间的信任可以分为身份信任和行为信任两种，其中行为信任关注的是更广泛意义上的可信性问题，具有动态性和不确定性等特点，实体可以根据彼此之间的交互经验动态更新实体间的信任关系。而可信计算技术是为应对计算机安全问题而提出的一种底层的、整体的解决方案。该文以可信计算平台为基础，提出了一种网格环境中的行为信任模型，并对行为信任进行量化评估，最后对该模型中的几个关键问题进行了分析。关键字：网格；行为信任；声誉；可信计算Abstract：The “Trust” in a grid environment is an important problem in the development of grid computing.The trust notion in grid include identity trust and behavior trust,and behavior trust which is dynamic and uncertain concerns a wider notion of trustworthiness,and entities can update their mutual trust relationship among entities dynamically based on their past transaction experiences.Trusted computing technology is is an basic,entirely solution for security problems of computer.In this paper,a behavior trust model which is based on trused computin technology in grid and a method for measuring and evaluating the behavior trust are provided.At the end,we analyse some important problems in this model.Keywords：grid；behavior trust；reputation；trusted computing