Abstract. Ad hoc network is a peer-to-peer grid system. The combination of the Knowledge Grid and ad hoc network could have a great effect on the future interconnection environment. In the existed researches about ad hoc routing protocols, knowledge with trusted requirements is not supported. In this paper, the trust level is used as knowledge for routing. The security rather than shortest path is the primary concern of the method. The performance evaluation via simulations shows that the method is a promising trust routing algorithm for MANETs. The effects of this trust model on DSR route discovery mechanism are analyzed. Results show that our model can improve the performance of DSR route discovery.