根据卫星光交换网络的高带宽、低丢包率和高链路利用率应用需求，结合现有的地面光交换组装算法，提出了一种新的基于混合门限和轮询方式的星载光交换组装算法。算法首先按照优先级缓存分组，再按照混合门限和轮询方式组装IP分组，减少突发数据包的空闲率，提高了链路利用率。理论分析与仿真证明该算法计算复杂度与轮询方式相同，突发数据包空闲率低于10-4，丢包率在负载为0.5时平均达到10-6，适用于星载光交换系统。

According to the high bandwidth, low packet-loss ratio, high channel utility requirements of satellite optical switching network, an on-board assembly algorithm based on mixed threshold and round-robin scheme is proposed combining the ground optical assembly algorithm. The algorithm caches the IP packet according to the parity, and assembles the packet according to the mixed threshold and round-robin scheme. Through the scheme, the padding ratio of burst is lowered. From the results of analysis and emulation, it is found that the complexity is the same as that of the round-robin method; the padding ratio of burst data packer is less than 10-4 when the load is 0.65, and the packet loss rate is 10-6 when the load is 0.5. This algorithm meets the requirements of optical satellite communications.