To　solve　the　problem　that　the　change　of　curve　slop　was　not　considered　in　the　common　corrosion　fatigue　crack　growth,　a　new　corrosion　fatigue　crack　propagation　model　based　on　Pairs　formula　was　established　in　this　paper;　which　corrected　parameters　C　and　n　of　Paris　formula　at　the　same　time.　Based　on　the　fatigue　crack　propagation　experimental　data　of　X70　pipeline　steel　in　hydrogen　sulfide　corrosive　environment,　the　key　parameters　of　the　model　were　fitted.　Based　on　the　new　model,　a　FRANC3D　software　was　used,　and　the　corrosion　fatigue　crack　propagation　processes　of　X70　pipeline　steel　in　corrosive　solution　were　simulated.　It　was　demonstrated　that　the　simulated　fatigue　crack　growth　processes　obtained　by　the　boundary　element　method　were　very　close　to　the　test　results,　and　the　maximum　error　is　less　than　10%.　Therefore,　boundary　element　method　can　be　used　to　predict　the　life　of　corrosion　fatigue　on　the　project.　©　(2014)　Trans　Tech　Publications,　Switzerland.