The　axial　compression　simulation　of　conical　tubes,　which　had　cone　inclination　from　0°　to　40°　and　wall　thickness　from　1mm　to　2.5　mm,　LS-DYNA　software　was　applied　to　study　the　influences　of　cone　inclination　and　wall　thickness　on　the　energy　absorption　characteristics　and　deformation　law　of　conical　tubes.　In　addition,　the　instantaneous　load　correction　formula　for　the　wide　range　of　the　cone　inclination　angle(15°~40°)　was　proposed　based　on　the　instantaneous　load　collapse　model　of　Mamalis　conical　tube.　The　results　show　that　the　critical　angle　of　the　deformation　mode　is　15°,　but　the　deformation　mode　is　in　the　stacked　mode　when　the　cone　inclination　is　less　than　15°　and　it　is　in　the　nested　mode　when　the　angle　is　greater　than　15°.　Moreover,　with　the　increase　of　the　cone　angle,　the　average　load　and　the　specific　energy　absorption　decreases　gently,　while　the　initial　peak　load　decreases　significantly.　It　should　be　noted　that　with　the　increase　of　wall　thickness,　the　crushing　mode　must　transform　from　the　diamond　mode　into　the　annular　symmetry　mode　while　the　average　load,　the　initial　peak　load　and　the　specific　energy　absorption　increase.　The　simulation　results　illustrate　that　the　Mamalis　instantaneous　load　formula　is　modified　by　the　Pearson　correlation　coefficient　analysis　method　and　the　maximum　error　is　less　than　10%　between　the　modified　value　and　the　simulation　value,　In　addition,　the　accuracy　of　the　modified　formula　was　verified　by　the　experiments.　In　brief,　the　correction　formula　provides　a　theoretical　basis　for　revealing　the　mechanism　of　crushing　of　thin-walled　tubes　with　large-scale　tapered　inclination.　©　2022　China　Mechanical　Engineering　Magazine　Office.　All　rights　reserved.