The　action　of　the　soil　settlement　is　one　of　the　most　important　reasons　leading　to　the　failure　of　buried　pipelines.　The　settlement　may　result　in　the　buckling　of　large-diameter　underground　pipelines　crossing　the　subsidence　region,　which　makes　the　pipelines　out　of　work　before　reaching　the　tensile　and　shear　strength　of　the　pipes.　The　pipelines　and　the　surrounding　soil　are　taken　out　together　from　the　semi-infinite　soil　medium,　and　the　pipe-soil　interaction　model　under　the　site　soil　settlement　is　established.　In　the　model,　the　pipeline　is　simulated　by　thin-shell　element,　while　the　surrounding　soil　is　simulated　by　solid　element.　The　linear　eigenvalue　buckling　analysis　method　is　adopted　to　study　the　buckling　stability　behavior　of　the　pipe　subjected　to　the　soil　settlement,　and　buckling　modes　of　the　pipes　and　corresponding　soil　settlement　are　gained.　At　last,　some　influencing　factors　on　the　buckling　of　the　buried　pipeline　are　studied,　such　as　the　length　of　the　subsidence　region,　buried　depth,　pipe　diameter　and　wall-thickness　of　pipe,　etc.　From　the　above　adopted　model　and　assumption,　it　is　shown　that　the　shallower　the　buried　depth　is,　the　more　easily　buckling　the　pipeline　is;　the　larger　the　diameter-thickness　ratio　is,　the　more　easily　buckling　the　pipeline　is;　the　harder　the　soil　is,　the　more　easily　buckling　the　pipeline　is.