Seismic　performance　analysis　of　water　distribution　system　(WDS)　is　an　essential　step　in　the　seismic　design　and　resilience　evaluation　of　WDS.　Network　connectivity　reliability　analysis　and　the　flow-based　hydraulic　simulation　methods　are　widely　used　in　the　seismic　performance　analysis　of　WDS.　Many　researchers　choose　one　of　these　methods　for　seismic　performance　evaluation　of　WDS,　but　the　comparison　between　the　application　results　of　these　two　methods　is　insufficient.　This　work　compares　the　analysis　results　of　the　two　methods　through　the　application　of　benchmark　WDS　cases　in　which　the　connectivity　reliability　and　the　water　demand　performance　of　user　nodes　are　used　as　quantitative　measures;　the　two　methods　were　conducted　based　on　the　Monte　Carlo　Simulation　to　consider　the　uncertainty　of　seismic　damages　of　pipelines.　Three　widely-used　benchmark　WDSs　(Modena,　C-Town,　Exnet)　with　different　characteristics　were　used　for　case　study.　Through　the　application　results　of　the　benchmark　WDSs　under　different　seismic　damage　scenarios,　the　correlation,　consistency,　and　statistical　characteristics　between　the　results　of　the　two　methods　were　compared.　The　results　show　that　the　correlation　and　consistency　between　the　connectivity　reliability　and　the　water　demand　performance　measure　is　low;　the　seismic　connectivity　reliability　usually　has　a　larger　value　than　that　of　the　water　demand　performance;　user　nodes　with　lower　connectivity　reliability　may　not　necessarily　have　lower　levels　of　water　demand　performance.　The　hydraulic　simulation　method　is　considered　to　be　a　more　reliable　analysis　method　because　it　includes　both　the　geometry　topology　of　pipelines　and　the　hydraulic　characteristics　of　WDS.