Abstract: Develops a new distributed P2P trust model named NBRTrust (node behavior relation trust) for appraising the degree of confidence of nodes. The global trust model NBRTrust with the correlativities between nodes as factors was developed. A distributed network β-list was built in correlation with the communication histories of nodes to appraise locally the degree of confidence of nodes, then the behavioral correlativities between nodes were computed distributively. Defines the mathematical expression of the model and distributed computation, with the P2P communication model developed on the basis of NBRTrust model. Simulation results revealed that the NBRTrust model is more objective and effective than the simply local or global trust model, which is able to resist efficiently the fraudulent acts from a single or grouped malignant nodes.