Corroded　steel　pipelines　are　particularly　vulnerable　to　failure　due　to　ground　movement,　which　highlights　the　need　to　improve　their　seismic　resistance　through　reinforcement　methods.　This　paper　establishes　a　three-dimensional　finite　element　model　of　a　corroded　steel　pipeline　subjected　to　a　reverse　fault,　which　considers　the　effects　of　the　corrosion　position　and　depth,　winding　thickness,　and　length　of　carbon　fiber-reinforced　polymer　(CFRP),　to　investigate　the　stress,　strain,　elliptic　deformation,　and　failure　modes　of　the　pipeline　before　and　after　CFRP　reinforcement.　Results　indicate　that　the　main　failure　mode　of　the　intact　and　corroded　pipeline　crossing　the　reverse　fault　is　local　buckling.　Corrosion　intensifies　the　response　of　the　cross-fault　pipeline,　accelerates　its　failure　occurrence,　and　promotes　transformation　from　a　single　failure　mode　to　multiple　failure　modes.　For　CFRP　reinforcement,　an　increase　in　CFRP　winding　thickness　can　effectively　inhibit　the　growth　of　the　pipeline’s　compressive　strain,　thus　reducing　the　buckling　potential.　Each　additional　CFRP　layer　can　further　enhance　the　overall　buckling　resistance　but　at　a　decreasing　rate.　Similarly,　longer　CFRP　winding　improves　buckling　resistance　though　the　effectiveness　per　meter　decreases.　Therefore,　it　is　recommended　that　the　thickness　and　length　of　CFRP　winding　on　the　pipeline　should　be　optimized　to　obtain　the　best　reinforcement　at　a　reasonable　cost.　©　2024　by　the　authors.