Abstract: The space-based information system,(SBIS) is an important aerospace equipment to obtain the information superiority in the battlefield with a dynamic network of spatial-temporal feature.A modeling for the SBIS network topology was proposed,which is on the basis of the modeling of nodes and links,using static and dynamic modeling to describe the SBIS network topology regularity in the operation.The static model describes the topologic structure at a given break.In the proposed dynamic model,time break and timeslice were defined,and an algorithm of timeslice dividing was presented.Finally,a simulation sample with 12 nodes was built.The simulated results indicate the topology models built are reasonable that can reflect the regularity of the SBIS network in a certain extent.