In　this　paper,　the　molecular　dynamics　technique　is　utilized　to　simulate　crack　propagation　within　the　localized　vicinity　of　the　crack　tip,　aiming　to　investigate　the　plastic　deformation　behavior　of　the　α-Fe　crack　tip　under　different　crystal　orientations.　The　influences　of　crystal　orientation　on　the　mechanical　properties　of　the　models　were　obtained,　and　the　weakest　crystal　orientation　associated　with　fracture　was　determined.　Meanwhile,　the　plastic　deformation　mechanism　of　the　α-Fe　model　under　different　crystal　orientations　was　obtained　by　analyzing　the　microscopic　atomic　evolution　process　of　the　four　models.　©　2024　Institute　of　Physics　Publishing.　All　rights　reserved.