According　to　the　seismic　damage　mechanism　of　the　buried　pipeline,　the　seismic　performance　of　single　pipeline　is　evaluated　quantitatively.　The　network　connectivity　is　analyzed　with　Monte-Carlo　method　and　seismic　performance　of　the　whole　network　system　is　evaluated　quantitatively.　Finally,　the　anti-seismic　reliability　of　the　main　water　supply　system　is　analyzed　in　the　City　of　Fuzhou.　The　results　indicate　that　the　proposed　method　is　feasible,　accurate　and　effective,　which　provides　references　for　further　research　of　design,　optimization　and　reformation　of　the　urban　buried　pipeline.