In　order　to　promote　the　crack　initiation　and　shorten　the　crack　propagation　time,　the　application　of　eccentric　notch　in　low　stress　cutting　technology　was　proposed.　Using　finite　element　analysis　and　ZHENG-HIRT　fatigue　crack　growth　rate　formula,　the　effects　of　eccentric　notches　on　the　stress　concentration　effect　and　fatigue　crack　propagation　time　of　V-notch　in　bars　were　discussed.　The　results　show　that　during　the　crack　initiation　stage,　the　stress　concentration　effect　at　each　point　of　the　eccentric　incision　tip　is　unevenly　distributed,　and　the　stress　concentration　effect　is　significantly　enhanced　at　the　deepest　point　of　the　eccentric　incision,　which　creates　more　favorable　conditions　for　local　cracking　here.　During　the　crack　growth　stage,　the　nominal　notch　eccentricity　e/b　is　in　the　range　of　0-0.12,　and　as　e/b　increases,　the　fatigue　crack　growth　time　decreases　significantly,　but　when　e/b＞　0.12,　the　trend　of　fatigue　crack　growth　time　tends　to　change　gently.　After　comprehensive　consideration　of　the　cropping　time　and　eccentric　incision　processing,　and　select　e/b　=　0.12　as　the　best　value.　The　changing　trend　of　the　cropping　time　with　the　eccentric　notch　and　the　theoretical　fatigue　crack　propagation　time　with　the　eccentric　notch　is　consistent.　In　terms　of　section　quality,　e/b　is　not　the　bigger　the　better.　But　in　general,　the　quality　of　the　section　with　eccentric　incision　is　better　than　that　without　eccentric　incision.　©　2020,　Central　South　University　Press.　All　right　reserved.