The　comprehensive　indicator　system　of　seismic　serviceability　assessment　of　water　supple　network　is　established　in　terms　of　nodal　pressure　and　flow　of　water　supply　network.　According　to　many　uncertain　characteristics　of　influencing　factors,　Hence　a　new　method　for　seismic　serviceability　assessment　of　water　supple　network　is　presented　in　this　paper.　The　method　has　two　advantages　of　considering　two　uncertain　characteristic　and　realizing　seismic　serviceability　assessment　qualitatively　and　quantitatively　based　on　cloud　model　and　matter　element　theory.　The　method　uses　cloud　model　to　express　the　things　eigenvalue　of　matter　element,　calculates　the　correlation　function　of　feature　matter　element　models　and　standard　ones,　and　identifies　the　seismic　serviceability　grades　of　water　supple　network.　The　application　results　indicate　the　method　is　effective　and　can　reflect　practical　conditions　of　seismic　serviceability　assessment　of　water　supply　network.