Based　on　a　buried　water　supply　network　in　Beijing,　the　two-dimensional　finite　element　models　for　the　network　are　developed　in　this　study.　The　influences　of　the　critical　parameters,　such　as　the　pipe　diameter,　joint　type,　site　condition,　intensity　level　of　ground　motion　and　incident　angle　of　seismic　wave,　on　the　axial　and　bending　deformations　of　pipe　joints　are　systematically　investigated,　and　the　seismic　damage　status　of　the　water　supply　network　under　different　intensity　levels　of　earthquakes　is　evaluated.　Moreover,　the　criteria　for　damage　assessment　of　the　pipelines　based　on　joint　deformation　are　developed　through　the　statistical　analysis　of　the　test　results　of　the　worldwide　pipeline　joints.　These　criteria　are　subsequently　used　for　the　seismic　damage　assessment　of　different　types　of　pipeline　joints.　A　seismic　damage　database　of　typical　pipeline　joints　buried　in　different　engineering　sites　is　established.　Finally,　according　to　the　pipeline　properties,　engineering　site　conditions　and　seismic　damage　database　of　typical　pipeline　joints,　the　seismic　damage　distribution　maps　of　water　supply　networks　are　developed　using　the　GIS.　It　is　found　that　the　peak　deformations　of　the　joints　at　the　pipeline　cross　junctions　are　about　1.5　to　2.0　times　those　of　the　joints　in　a　straight　pipeline　under　the　same　intensity　of　earthquake　ground　motions.　Besides,　sudden　changes　of　the　peak　seismic　deformations　occur　at　the　push-on　joints　adjacent　to　the　flange　joints.　The　pipeline　network　suffers　much　more　severe　seismic　damage　under　the　considered　maximum　earthquake　than　under　the　design　level　of　earthquake.　The　seismic　damage　mainly　concentrates　in　the　site　class　Ⅳ　and　the　cross　junction　of　the　pipelines.　©　2023　Chinese　Society　of　Civil　Engineering.　All　rights　reserved.