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Due to the uncertainty of transmission opportunities between mobile nodes, delay tolerant networks (DTN) routing exploits the opportunistic forwarding mechanism. This mechanism requires nodes to forward messages in a cooperative way. However, in the real word, most of the nodes exhibit non-cooperation behaviors such as dropping and not relaying messages. In this letter, we investigate the problem of how the non-cooperation behaviors of nodes influence the performance of DTN routing algorithms of two-hop relay and epidemic routing. First, we model the message delivery process with non-cooperation behaviors by a two dimensional continuous time Markov chain. Then, we obtain the system performance of message delivery delay and delivery cost by explicit expressions. Numerical results show that different non-cooperation behaviors may have opposite impacts on different routing algorithms …