Global　climate　change　and　rapid　urbanization　increase　the　risk　of　urban　flooding,　especially　in　China.　Climate　change　and　the　＇heat　island　effect＇　have　increased　the　frequency　of　extreme　precipitation.　Affected　by　the　backwardness　of　drainage　facilities　and　the　lack　of　drainage　capacity,　many　cities　have　experienced　large-scale　waterlogging　in　low-lying　areas,　and　ocean-like　phenomena　appear　in　cities.　The　public　infrastructure　was　damaged　and　caused　a　lot　of　economic　losses.　Therefore,　it　is　important　to　investigate　the　adaptability　of　drainage　systems　to　the　future　in　a　changing　environment.　The　Sixth　International　Coupled　Model　Intercomparison　Project　(CMIP6)　and　Storm　Water　Management　Model　(SWMM)　were　used　to　quantify　the　impact　of　climate　change　on　Beijing＇s　waterlogging　under　different　rainstorm　scenarios　for　the　future　40　years.　The　quantile　delta　mapping　method　of　daily　precipitation　based　on　frequency　(DFQDM)　is　proposed　to　correct　the　daily　precipitation　of　the　climate　model　and　which　is　proved　to　be　feasible.　After　the　annual　precipitation　and　extreme　precipitation　index　are　corrected,　percent　bias　(PBIAS)　is　significantly　reduced.　The　PBIAS　of　the　extreme　precipitation　index　of　the　corrected　model　is　all　controlled　within　6%.　The　corrected　accuracy　of　CanESM5　is　the　best.　The　total　flood　volume　(TFV)　of　the　node　increases　with　the　aggravation　of　climate　change.　The　TFV　of　SSP5-8.5　and　SSP2-4.5　increased　by　45.43　and　20.8%　in　the　100-year　return　period,　respectively,　and　more　than　94%　of　the　conduits　reached　the　maximum　drainage　capacity　in　different　return　periods.　After　the　low　impact　development　(LID)　was　installed,　the　improvement　effect　on　the　outflow　with　a　smaller　return　period　was　significant,　decreasing　by　about　50%.　The　LID　can　effectively　reduce　the　overflow　of　the　drainage　system.　The　results　of　this　study　can　provide　suggestions　for　the　reconstruction　of　the　drainage　system　and　the　management　of　flood　risk　for　Beijing　in　the　future.