To　study　the　influence　of　hydrogen　corrosion　on　mechanical　properties　of　materials,　this　paper　adapted　45　steel　to　determine　each　mechanical　property　parameter　of　45　steel　by　tensile　test　method　under　different　corrosion　concentration　and　time　as　well　as　different　states,　including　non-hydrogen　escape　and　hydrogen　escape.　And　the　changing　rule　of　strength　index　and　plastic　index　of　material　during　the　process　of　hydrogen　corrosion　was　obtained.　The　result　shows　that　the　strength　index　of　material　just　has　few　changes,　its　yield　strength　fluctuates　within　-5.6Mpa　and　7.8Mps　and　tensile　strength　reduces　by　about　2%.　After　corroding,　the　plastic　index　reduces　obviously　and　it　is　mainly　affected　by　corrosion　concentration　whether　it　is　in　non-hydrogen　escape　state　or　in　hydrogen　escape　state.　Despite　that　the　plastic　index　of　hydrogen　escape　state　is　higher　than　that　of　non-hydrogen　escape　state,　it　still　is　less　than　the　original　value.　In　the　inner　of　metal,　the　influence　of　diffused　hydrogen　on　plastic　index　is　stronger　than　that　of　solid　solution　hydrogen.　©　Published　under　licence　by　IOP　Publishing　Ltd.