本文提出了一个具有星际链路的LEO&MEO(低轨和中轨 )双层卫星通信系统 ,详细介绍了系统结构、协议体系并重点研究了双层卫星系统的路由问题 .为了适应宽带多媒体通信的需要 ,系统采用了ATM快速分组交换技术 .提出了基于Dijkstra算法的双层卫星网络时延最短路由策略和时延抖动最小路由策略 ,并通过计算机仿真研究了它们的性能 ,得到了具有一定参考价值的结果 . This paper presents a LEO & MEO (low orbit) dual satellite communication system with interplanetary link, introduces the system structure and protocol system in detail, and focuses on the routing problem of the double satellite system.In order to meet the needs of broadband multimedia communication , The system adopts ATM fast packet switching technology, proposes the shortest delay routing strategy and delay jitter minimum routing strategy based on Dijkstra algorithm in double-layer satellite networks, and studies their performance through computer simulation, and obtains some reference values Results.