Recently,　blockchain　has　been　used　in　financial　payment,　smart　medicine,　drones　and　other　scenarios　with　its　decentralized　trust　mechanism,　distributed　data　storage,　and　non-tamper　proof.　Differentiated　quality　of　service　(QoS)　assurance　has　become　a　measure　to　deal　with　the　multi-directional　expansion　of　blockchain　and　the　wide　range　of　application　scenarios,　but　there　are　still　problems　that　need　to　be　solved　in　terms　of　providing　differentiated　QoS　assurance.　The　blockchain　provides　two　basic　services,　transactions　and　block　synchronization.　The　QoS　requirements　of　the　application　scenarios　are　not　considered.　This　paper　deploys　the　named　data　networking　(NDN)　at　the　network　layer　of　the　blockchain.　In　this　paper,　packets　are　shaped　hop-by-hop　at　the　router　node.　The　window　sliding　strategy　is　used　to　establish　the　mapping　relationship　between　packets　and　windows,　so　as　to　speed　up　the　processing　speed　of　packets　and　reduce　the　average　delay　of　packet　transmission.　This　paper　also　designs　a　forwarding　strategy,　which　distributes　packets　to　the　forwarding　queue　according　to　the　delay　sensitivity　of　the　packets　in　the　sliding　window　and　the　possibility　of　packet　timeout,　so　as　to　meet　the　delay　requirements　of　delay-sensitive　packets.　©　2022　IEEE.