15CrMo　steel　is　widely　used　in　engineering.　In　order　to　evaluate　the　fatigue　performance　of　15CrMo,　axial　loading　for　15CrMo　specimen　has　applied　by　high　frequency　fatigue　testing　machine　under　stress　ratio　R=0.1　at　room　temperature,　the　linear　S-N　relationship　has　obtained　by　grouping　fatigue　test,　the　fatigue　limit　has　obtained　and　compared　by　two　different　fatigue　limit　analysis　method.　The　consequences　of　this　test　could　provide　a　theoretical　support　for　the　use　of　15CrMo　in　engineering　and　the　research　of　fatigue　limit　theory.　©　(2013)　Trans　Tech　Publications,　Switzerland.