The features of mobile ad hoc network such as self-organization, mobility bring the convenience of network, but also increase the difficulty of routing management. To solve the limits of the existing reliable route protocol and its inefficient access to link information, according to DSR (dynamic source routing) protocol, a reliable routing protocol based on local trust system (TR-DSR) is proposed. TR-DSR completely considers and uses the reliability of each node and each link to find reliable routes. Moreover, the system also reduces overhead routing during this process. Meanwhile, to reduce the impact of selfish nodes to improve the correctness of the trust system, the DFR (decide forwarding recommendation) algorithm based on GTFT (generous tit for tat) strategy which motivates response to recommendation requests, is provided. Simulation results indicate that in more challenging situations of high mobility and selfish nodes, TR-DSR can improve the performance significantly and prove the reliability of TR-DSR.