Space information networks

which have become a popular research focus

are a new type of Ad Hoc networks constituted by information systems of land

sea

air and space.This paper proposed a topology reconfiguration scheme combing protection and recovery strategies according to the features and application demands of space information networks.Detection of key nodes in topology and topology failures both trigger reconfiguration process.In reconfiguration process

selected redundant nodes move under the guidance of virtual forces to reconfigure topology.Redundant nodes jointly optimize topology next with targets of minimizing communication cost of designated repairing areas.Simulation results show the proposed topology reconfiguration scheme can improve network performances as well as network invulnerability.