Abstract: In the Web service，a new model based on the group’s trust is proposed，to eliminate and control bad behaviors of nodes，and to encourage good behavior of providing reliable services，and to establish an effective credible assurance mechanism.The model takes into account the individualization of node’s experiences and group’s behaviors.The analysis shows that the new model reduces the scale of computing values of global reputation，and improves the efficiency of calculation，and solves sparseness of access in a large-scale distributed network to a certain degree，and possesses some incentive and robustness.

摘要： Web服务中，为了消除和抑制节点的不良行为，鼓励提供可靠服务的良好行为，建立有效的可信保证机制，提出了一种新的基于群组的信任模型。该模型考虑了节点的经验个性化和群组行为个性化等问题，分析表明：新模型降低了全局信誉求解的规模，提高其计算的效率；一定程度上解决了大规模分布式网络中访问稀疏的问题；同时具有一定的激励性和鲁棒性。