The　traditional　blockchain　networks　cannot　meet　the　differentiated　Quality　of　Service　(QoS)demands　in　different　application　scenarios.To　solve　this　problem,　a　QoS　assurance　method　for　blockchain　network　based　on　Named　Data　Networking　(NDN)is　proposed.Transactions　and　blocks　are　categorized　according　to　real-time　requirements,　and　a　new　namespace　is　designed　for　them.　Then　different　data　propagation　structures　are　created　for　different　types　of　blockchain　data　to　reduce　the　concentration　of　traffic.　A　differentiated　routing　mechanism　is　adopted　to　queue　and　forward　transactions　and　blocks　according　to　the　different　real-time　performance　requirements　in　different　application　scenarios.　The　experimental　results　show　that　the　proposed　method　can　significantly　improve　the　information　transmission　efficiency　of　blockchain　network,　and　reduce　the　redundant　traffic　in　the　network.　It　can　also　decrease　the　intra-network　traffic　by　about　24%　compared　with　TCP-based　blockchain　networks.　©　2021,　Editorial　Office　of　Computer　Engineering.　All　rights　reserved.