提出了一种云计算环境中柔性易扩展的信任协商机制-基于相似信任度的信任协商机制,在该信任协商机制中,直接信任度计算过程中加入了为用户节点提供服务的服务时刻和服务成本等信任因素,间接信任度计算过程中加入了参与评价的云服务节点个数、评价用户节点的服务总量、评价用户节点所给评价的相似度等信任因素,并且详细讨论了这些信任因素的获取和计算方法. This paper proposes a flexible and scalable trust negotiation mechanism in cloud computing environment based on trust of similar trust. In this trust negotiation mechanism, the service moments and services for serving user nodes are added in the process of calculating the direct trust degree Cost and other trust factors. The indirect trust degree is added with the number of cloud service nodes participating in the evaluation, the total amount of services evaluated by user nodes, and the similarity of the ratings evaluated by user nodes. The trust factors Get and calculate method.