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Abstract-T Opportunistic networks is a kind of selforganizing networks which does not need the complete communication paths between the source node and the destination node. They transfer messages through communication opportunities arising from nodes movement. Because the message transmission opportunity depends on the movement of nodes, the mobility model becomes an important research hotspot in the opportunistic networks. Meanwhile mobility models are usually used for simulation purposes when new network protocols are evaluated. Firstly, this paper outlines the significance and classification of mobility model, and shows the classical mobility models at the present stage. Secondly, we summarize the mobility characteristic of nodes, and compare and analyze the classical mobility models. Finally, we summarize the existing problems and challenges for the current mobility model and look forward to the future research and development.

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