To optimize the design of high capacity satellite on board label switches

a new flow control mechanism and a new satellite on board switch structure are proposed.According to the buffer utilization of different input ports of on board switch

the terrestrial network gates can adjust the scheduling weights of output for different down ports of satellite on board switch to avoid buffer overflow.The relationship of buffer depth

adjustment threshold of on board switch and the scheduling weights in terrestrial gates are simulated with NS2 under the condition of long propagation delay

which will be helpful to the design of high-throughput on board label switches and the design of terrestrial network.