The　seismic　vulnerability　analysis　for　water　supply　network　may　help　us　find　out　security　risks　and　weak　links　in　the　network,　so　one　seismic　vulnerability　evaluation　model　for　water　supply　network　based　on　Monte　Carlo　simulation　was　proposed.　In　this　model　the　factors　that　affect　the　seismic　vulnerability　of　water　supply　network　were　considered　together,　and　the　nodes＇　vulnerability　weights　were　defined　from　four　aspects　as　follows:　the　importance　of　the　water　supply　partition,　topological　free　degree,　water　quantity　and　water　pressure　after　earthquake.　Then　the　calculation　formula　of　the　seismic　vulnerability　indexes　for　part　or　whole　of　the　water　supply　network　was　provided.　At　last　the　practical　application　and　steps　were　introduced　using　one　city＇s　water　supply　network　as　an　example,　the　results　show　that　the　model　proposed　in　this　paper　has　a　certain　commonality　and　may　used　in　seismic　vulnerability　analysis　for　water　supply　pipelines.