Abstract: Considering a single node in the wireless sensor networks can be compromised to malicious attacks and energy consumption for each node in the cluster can not be balanced，this paper proposes a trust model which is based on positive feedback.The model is based on positive feedback，because the cluster head gives the other node in the cluster a trust evaluation when it is at the end of cluster head.The trust evaluation result called trust list is sent to the candidate cluster immediately.For the trust list includes the history behavior of sending correct data and residual energy attribute，the trust evaluation result based on positive feedback is rotated reliably and cumulated incrementally.Simulation results and analysis show that：This trust model can eliminate the false data which are sent by malicious nodes effectively and identify failure nodes accurately，thereby optimizes the performance，provides a credible supporting environment for topology algorithm，data collection algorithm or compression algorithm etc.

Key words: wireless sensor networks, trust model, positive feedback, cluster head, compromise

摘要： 针对无线传感器网络中单个节点容易受到恶意攻击的妥协性和各个节点能量消耗的非均衡性，提出了一种基于正反馈的信任模型。该模型基于正反馈思想，在簇头节点的任期结束时对簇内节点进行信任考核，并将考核的结果称之为信任列表传给下一轮簇头。因为信任考核包括是否发送正确数据的历史行为和节点剩余能量的个体属性，基于正反馈的思想使得考核结果能在簇头间可靠轮转和增量累积。模拟实验与分析表明：该模型能有效剔除节点发送的虚假数据，并准确识别出失效节点，优化网络的性能，为拓扑控制算法、数据收集压缩算法等提供一个可信的支撑环境。

关键词: 无线传感器网络, 信任模型, 正反馈, 簇头, 妥协性