To　address　the　problem　of　unstable　data　transmission　caused　by　frequent　topology　changes　in　Aeronautic　Swarm　Network　(ASNET),　a　centralized　routing　algorithm　for　Quality　of　Service(QoS)　of　the　aeronautic　swarm　network　based　on　Software　Defined　Network(SDN)　is　studied.　First,　this　paper　designs　a　Software　Defined　Aeronautic　Swarm　Network　(SD-ASNET)　model.　Then,　taking　advantage　of　the　SDN　controller＇s　ability　to　obtain　global　link-state　information,　we　propose　a　Multiple　Link-state　Awareness　routing　(MLSA)　based　on　the　shortest　path　algorithm,　taking　into　account　link　bandwidth,　transmission　delay　and　other　factors.　The　simulation　results　show　that　the　proposed　centralized　routing　protocol　makes　full　use　of　the　centralized　decision-making　capability　of　the　SDN　controller,　and　effectively　optimizes　the　link　bandwidth　utilization　and　transmission　delay　by　using　link　parameter　information.　©　Published　under　licence　by　IOP　Publishing　Ltd.