[Objective]　The　pipe　section　collection　time　is　typically　based　on　the　theory　of　steady　full　pipe　uniform　flow　when　using　the　reasoning　formula　method　to　calculate　the　design　flow　of　a　storm　pipe　network,　but　the　actual　water　flow　in　the　storm　pipe　is　non-steady,　causing　errors　in　the　calculation　of　the　design　flow　that,　when　applied　to　a　larger　scale　pipe　network,　gradually　reduce　the　calculation　accuracy.　In　this　context,　the　paper　suggests　a　design　flow　computation　method　for　storm　pipe　networks　based　on　kinematic　wave　simulation.　[Methods]　In　this　paper,　the　design　flow　of　pipe　sections　is　solved　using　kinematic　waves　under　the　condition　of　ensuring　the　equivalent　setup　of　model　parameters　and　storm　pipe　network　starting　design　parameters.　This　paper　combines　the　Horton　infiltration　model　and　the　φ　index　method　to　calculate　infiltration　intensity　in　the　surface　rainwater　runoff　stage.　The　runoff　generation　is　calculated　with　the　objective　of　achieving　equivalence　of　the　volumetric　runoff　coefficient　and　discharge　runoff　coefficient.　Taking　surface　catchment　time　and　linear　confluence　curve　type　as　input,　and　coupling　with　the　isochrones　model,　the　equivalence　setting　of　design　conditions　and　stormwater　outlet　inflow　process　line　calculation　are　completed.　In　the　pipe　section　confluence　process,　the　pipe　section　flow　process　line　is　calculated　by　inputting　the　corresponding　stormwater　inlet　inflow　process　line　into　the　node　inflow　mode　and　computing　the　pipe　section　confluence　process　using　the　stormwater　management　kinematic　wave　model.　The　stormwater　inlet　inflow　process　line　of　the　designed　pipe　section　and　the　upstream　pipe　section　flow　process　line　connected　with　it　are　superimposed　to　complete　the　calculation　of　the　pipe　section　design　flow　process　line.　Combined　with　the　hydraulic　design　of　the　stormwater　pipe　section,　the　whole　storm　pipe　network　design　is　realized　based　on　the　geospatial　data　abstraction　library　development　technology　process.　[Results]　The　results　of　a　storm　pipe　network　example　in　a　particular　area　(with　a　total　size　of　4.506　km2)　showed　that:　(1)　When　compared　to　the　reasoning　formula　method,　the　stormwater　pipe　section　created　using　the　kinematic　wave　simulation　approach　had　a　quick　catchment　time　and　a　greater　design　flow　rate.　(2)　The　flow　calculation　difference　between　the　two　approaches　increased　over　time　as　catchment　time　and　catchment　area　increased,　reaching　a　maximum　increase　of　39.45%.　(3)　Under　the　10-year　rainfall　scenario,　the　design　storm　pipe　network　obtained　by　the　two　calculation　methods　of　equivalent　design　conditions　reduced　the　number　of　overflow　nodes,　total　overflow　volume,　and　length　of　pipe　section　overload　by　8.57%,　28.57%,　and　38.48%,　respectively,　compared　to　the　reasoning　formula　method.　[Conclusions]　By　comparing　the　differences　in　the　design　results　obtained　by　the　two　calculation　methods　for　different　catchment　times　and　catchment　areas,　it　can　be　seen　that　for　large　projects,　it　is　advisable　to　use　the　kinematic　wave　simulation　method　to　calculate　the　design　flow　of　the　storm　pipe　network.　In　a　simulated　analysis　with　a　10-year　exceedance　of　rainfall,　the　storm　pipe　network　designed　by　the　kinematic　wave　simulation　method　has　better　flood　prevention　performance.　©　2023　Press　of　Tsinghua　University.　All　rights　reserved.