In　order　to　improve　the　anti-seismic　performance　of　assembled　reinforced　concrete　(RC)　bridge　piers,　a　new　connection　configuration　using　a　hybrid　connection　of　cast-in-place　engineered　cementitious　composites　(ECC)　and　prefabricated　mortise-tenon　was　proposed.　Quasi-static　tests　of　three　assembled　RC　pier　specimens　using　hybrid　connections　(with　the　height　of　cast-in-place　ECC　segments　and　depth　of　the　notch　as　the　varying　parameters,　No.　DZ-1,　AC-200,　and　XJ-250)　and　one　assembled　RC　pier　specimen　using　a　cast-in-place　ECC　wet　connection　(No.　PT-1)　were　carried　out.　A　test　validated　ABAQUS　finite　element　model　was　established,　and　the　effects　of　parameters　such　as　the　axial　compression　ratio,　length-to-slender　ratio,　depth　of　notch,　and　height　of　cast-in-place　ECC　segments　on　the　anti-seismic　performance　of　assembled　RC　bridge　piers　were　analyzed.　Analysis　results　show　that　the　damage　modes　of　the　four　pier　specimens　are　all　compression　bending　damage,　and　the　cast-in-place　ECC　segments　of　each　specimen　arc　not　damaged.　Compared　with　the　PT-1　specimen,　the　peak　loads　of　assembled　RC　bridge　piers　with　cast-in-place　ECC　and　prefabricated　mortise-tenon　hybrid　connection　increase　by　25.　74%-30.　03%,　the　ultimate　displacement　increase　by　22.　75%-106.　39%,　and　the　residual　displacement　decrease　by　43.　70%-61.　42%,　which　indicates　better　anti-seismic　performance.　The　AC-200　specimen　has　the　largest　depth　of　notch,　and　its　residual　displacement　is　larger　than　that　of　the　other　assembled　bridge　piers,　with　poorer　energy　dissipation　capacity.　The　peak　load　and　yield　load　of　assembled　bridge　piers　increase　with　the　axial　compression　ratio　and　the　height　of　cast-in-place　ECC　segments　and　decrease　with　the　increase　in　the　lcngth-to-slender　ratio.　The　ductility　factor　increases　with　the　height　of　the　cast-in-place　ECC　segment　and　decreases　with　the　increase　in　the　lcngth-to-slender　ratio　and　axial　compression　ratio.　It　is　recommended　that　the　depth　of　the　notch　in　hybrid　connections　should　not　exceed　75%　of　the　side　length　of　the　tenon.　7　tabs,　21　figs,　30　refs.　©　2023　Chang＇an　University.　All　rights　reserved.