The　joint　type　and　cross　connection　pattern　of　buried　pipelines　have　a　significant　impact　on　the　seismic　responses　of　pipeline　structures.　As　the　seismic　deformation　and　stress　of　pipeline　cross　are　determined　by　the　structural　types　of　branch　pipelines,　a　finite　element　model　for　straight　branch　pipelines　is　firstly　established　to　investigate　the　joint　displacement　and　relative　pipe-soil　displacement　of　ductile　iron　pipelines　(DIP)　with　flexible　socket　rubber　joints　and　cast　iron　pipelines　(CIP)　with　rigid　joints　under　seismic　wave　propagation.　Then,　the　seismic　responses　of　pipeline　connections　using　cross-shaped,　T-shaped,　L-shaped　and　double-T-shaped　cross　connections　are　analyzed,　where　the　pipe　cross　is　connected　to　the　branch　pipelines　using　the　socket　or　flange　joints.　Furthermore,　the　effects　of　joint　types　on　the　seismic　responses　of　pipeline　cross　connections　are　evaluated.　The　results　show　that　for　the　straight　pipelines　with　different　types　of　joints,　the　peak　joint　displacement　of　the　DIP　with　flexible　joints　is　larger　than　that　of　the　CIP　with　rigid　joints.　When　the　pipe　cross　is　connected　with　the　socket　joints,　the　peak　joint　displacement　of　the　pipelines　with　double-T-shaped　cross　is　slightly　smaller　than　that　of　the　pipelines　with　cross-shaped　and　T-shaped　connections.　When　the　pipe　cross　is　connected　using　the　flange　joints,　the　DIP　with　flexible　joints　adjacent　to　the　flange　joints　exhibits　a　larger　joint　displacement　and　is　prone　to　tensile　failure,　while　the　CIP　with　rigid　joints　adjacent　to　the　flange　joint　experiences　greater　axial　compressive　force　and　is　prone　to　compressive　failure.　At　the　cross　of　double-T-shaped　pipelines,　the　responses　of　the　socket　joints　adjacent　to　the　flange　joints　are　significantly　larger　than　those　of　the　cross-shaped　and　T-shaped　connections.　©　2025　Chinese　Society　of　Civil　Engineering.　All　rights　reserved.