For　obtaining　fatigue　limit　and　dealing　with　censored　data,　the＂　pair-　life　-weighted＂　is　proposed　in　this　paper.　According　to　the　fatigue　testing　of　TA15　electron　beam　welded　specimens,　conventional　methods　and　two　methods　in　this　article　are　used　separately　to　calculate　the　fatigue　limit　and　lognormal　distribution　parameters　of　the　lives　at　different　stress　levels,　and　C-P-S-N　curves　are　obtained　and　their　corresponding　mathematical　expressions　of　12　groups　under　2　Confidence　and　6　reliability　are　expressed　as　a　three-parameter　model.　The　results　show　that　the＂　pair-　life　-weighted　method　＂is　in　good　agreement　with　the　traditional　method,　when　the　lives　have　a　difference　of　3　times　at　the　same　stress,　the　fatigue　limit　only　have　a　difference　of　0.5%,　it　is　the　further　evidence　of　the　practicability　in　engineering　about　the　traditional　method.