Abstract: The laser inter-satellite link has the technical characteristics of large transmission capacity and high transmission rate. The satellite node with the laser inter-satellite link function can be used as a high-speed backbone network node in the laser-microwave hybrid inter-satellite link network. How to deploy these high-speed nodes,so that,the constructed satellite network topology can reach the optimal goal. It is a research focus in the development of the inter-satellite link from microwave to laser transition. The application scenario is the navigation satellite constellation including 24 Medium orbit (MEO),3 Geochronous orbit(GEO) and 3 Inclined GeoSynchronous Orbit (IGSO) satellites. And the number of high-speed nodes is fixed Under the condition of, comprehensive geometric visibility, inter-satellite distance and engineering constraints and other constraints. With the minimum average end-to-end delay from the satellite network access node to the destination node as the optimization goal, a mathematical model is established. A high-speed node selection algorithm method based on multiple Source shortest path strategy hybrid inter-satellite link network is used to solve the optimal topology of the local laser high-speed node backbone network. Simulation results show that, the topological structure of local laser high-speed node backbone network can make the whole network transmission delay less and the communication performance is more effective.