Abstract: To improving the quality of service of the LEO network,the key factor is to transmit the data traffic generated during the operation to the ground station as soon as possible.Due to geopolitics and other factors,China’s deployment of ground stations overseas is greatly restricted,such situation makes the backhaul traffic gethering on certain few links,which can easily cause those links overload or even resulting in network congestion.To solve this problem,this paper proposes a traffic balancing routing algorithm based on cell division,in this algorithm,light and heavy load zones are divided according to the relative position relationship between ground station and the reverse slot,then the pre-balancing shortest path algorithm is used in the light load zone,and the minimum weight path defined by congestion index is the routing rule in the heavy load zone.Finally the consistent forwarding is performed referring to segment routing in all zones.Simulation results confirm that the traffic-balancing performance is improved significantly with the extension of the heavy load zone size in terms of the average rejection ratio,the average relative throughput,the maximum link utilization, and the average delay,which can effectively limit the occurrence of network congestion.