The　corrosion-protection　liner　(CPL)　technology　consists　of　installing　flexible　plastic　liners　with　anchoring　studs　inside　existing　pipelines　and　subsequently　filling　cement　mortar　to　the　gap　between　the　waterproof　liner　and　the　pipeline.　With　the　excellent　chemical　resistance,　impermeability　and　fast　construction　speed,　CPL　provides　an　economical　and　environmentally　friendly　alternative　for　pipeline　rehabilitation　without　large-scale　excavation.　However,　the　seismic　performance　of　water　supply　pipelines　after　being　retrofitted　with　CPL　has　not　been　well　studied　yet.　In　this　study,　a　series　of　full-scale　quasi-static　experiments　were　firstly　conducted　on　ductile-iron　push-on　joints　before　and　after　reinforcement　with　CPL　to　investigate　the　nonlinear　behavior　of　the　joints　under　longitudinal　load　and　transverse　bending.　Simplified　numerical　models　of　straight　pipelines　with　joints　before　and　after　retrofitting　in　the　non-uniform　site　were　then　developed　in　the　OpenSees　platform,　and　incremental　dynamic　analysis　(IDA)　were　performed　with　consideration　of　nonlinear　soil-pipeline　interaction.　Twenty-eight　pairs　of　ground　motions　with　the　peak　ground　velocities　(PGV)　collectively　scaled　from　200　mm/s　to　3000　mm/s　were　used　as　inputs.　Seismic　fragility　curves　of　the　pipelines　before　and　after　retrofitting　were　developed　with　respect　to　the　optimum　intensity　measure,　PGV.　It　can　be　seen　from　the　experimental　results　that　the　longitudinal　load　and　bending　moment　capacity　of　the　push-on　joint　increased　about　400%　and　20%　after　CPL　reinforcement,　respectively,　and　the　joint　opening　and　rotation　decreased　about　20%　and　18%　after　retrofitting.　Numerical　results　show　that　the　CPL　reinforced　pipelines　exhibit　better　seismic　performance　and　CPL　effectively　reduces　the　failure　probability　of　segmented　pipelines　under　earthquake　ground　excitations.