Abstract: Delay/Disruption Tolerant Networks (DTN) are an abstract network model different from traditional networks,which is proposed based on interplanetary networks. This paper provided an overview on recent development in these areas of DTN, including network protocol, routing algorithm, multicast schemes, and security mechanism. It also analyzed and compared in detail kinds of protocols, algorithms, and mechanisms about DTN in performance and fealures, and pointed out some open research issues and the further development

Key words: Delay/disruption tolerant networks, Network protocol, Routing algorithm, Multicast, Security mechanism