Abstract: In this paper,the non-topological information routing algorithms in DTN was analyzed．Then,a model based dynamic routing algorithm(MDRA)for DTN was proposed． Aiming at the difficulty of getting node location in advance,a process was designed to dynamically update node visiting probability and encountering probability,which can help adaptively choose the relaying nodes．Simulation implementation and performance analysis of the proposed MDRA were done．Simulation results show that with the MDRA algorithm running in DTN,the delivery ratio of the transferred message is increased and the time delay is reduced,and at the same time the generation of numerous redundant copies of the transferred message is avoided.

Key words: Delay/disruption tolerant network,Non-topological information,Model based,Dynamic routing