As　one　type　of　Advanced　High　Strength　Steel(AHSS),　boron　B1500HS　steel　is　widely　used　in　engineering,　especially　in　automotive　industry.　In　order　to　study　the　fatigue　performance　of　B1500HS　in　the　delivery　state　and　after　quenching,　the　experiment　studied　two　kinds　of　specimens　-the　quenched　and　unhardened　specimens-by　grouping　test　and　staircase　test.　Axial　loading　was　applied　by　high　frequency　fatigue　testing　machine　under　stress　ratio　R=　0.1　at　room　temperature.　The　boron　B150OHS　steel＇s　linear　S-N　relationships　of　the　two　different　states　are　obtained　by　grouping　fatigue　test.　The　fatigue　limits　are　obtained　by　staircase　test.　The　test　results　show　that　there　is　no　obvious　diversity　analyzed　by　British　standard　and　pairing　staircase　method.　The　fatigue　limit　of　the　quenched　boron　B1500HS　steel　is　about　630Mpa,　and　the　unhardened　is　about　505Mpa.　The　fatigue　limit　of　the　quenched　boron　B1500HS　steel　is　higher　than　the　unhardened　about　125MPa.　The　consequences　of　this　test　could　provide　a　theoretical　support　for　the　use　of　B1500HS　in　engineering　and　the　research　of　fatigue　limit　theory.