This　work　presents　an　investigation　on　the　compressive　strain　capacity　of　resisting　buckling　on　an　X80　steel　corroded　pipeline　subjected　to　a　bending　moment　using　nonlinear　finite　element　analysis　(FEA)　validated　by　full-scale　tests.　The　modelling　results　indicate　that　the　existing　strain-based　assessment　method　is　not　suitable　for　pipelines　with　deep　corrosion　and　has　certain　application　limitations.　Consequently,　a　new　evaluation　method　based　on　far-field　strain　was　developed　to　predict　the　buckling　failure　of　corroded　pipelines　subjected　to　bending　loads.　The　influence　of　the　corrosion　shape　type,　corrosion　size　(i.e.,　depth　d,　length　L,　and　width　w),　pipe　geometry,　and　internal　pressure　on　the　critical　buckling　strain　capacity　and　critical　buckling　moment　of　the　pipeline　were　studied　using　parameter　sensitivity　analysis　to　verify　the　proposed　strain　criteria.　The　results　illustrate　that　the　variation　trends　between　the　critical　buckling　strain　and　the　critical　buckling　moment　with　each　factor　were　consistent,　indicating　that　the　proposed　novel　strain-based　evaluation　method　is　effective　and　applicable.　In　addition,　the　buckling　resistance　of　a　pipeline　with　rectangular　corrosion　is　relatively　weaker　than　that　with　a　semi-spherical　corrosion　pit　or　cylindrical　grooved　corrosion　under　the　same　defect　size.　Further,　the　critical　compressive　strain　capacity　of　a　corroded　pipeline　is　primarily　affected　by　the　depth　and　width　of　the　corrosion,　whereas　the　effect　of　the　corrosion　length　is　relatively　insignificant.　Moreover,　the　critical　length　and　width　of　the　corrosion　defect　affecting　the　bending　capacity　of　resisting　buckling　were　determined　as　L/root　Dt　=　root　20　and　omega/pi　D　=　0.5,　respectively.