The　stress　intensity　factor　(SIF)　solutions　for　subsurface　flaws　in　flat　plates　are　provided　in　Appendix　A　of　ASME　Boiler　and　Pressure　Vessel　Code　Section　XI.　A　part　of　the　SIF　solutions　was　initially　provided　in　the　2015　edition.　The　solutions　were　obtained　for　the　fourth　order　polynomial　stress　distribution　base　on　the　influence　function　method.　The　solutions　were　expanded　in　the　2021　edition　for　subsurface　flaws　near　the　surface　of　the　plate.　The　additional　solutions　were　obtained　based　on　the　J-integral　from　the　elastic　finite　element　analyses.　However,　recent　investigations　have　found　that　there　is　a　minor　discrepancy　in　trend　between　the　two　sets　of　SIF　solutions　because　they　were　obtained　by　using　different　numerical　methods.　Although　the　discrepancy　is　very　small,　the　change　in　trend　causes　some　difficulties　in　engineering　applications.　In　this　work,　the　SIF　solutions　are　recalculated　using　the　same　numerical　method　based　on　the　J-integral　from　elastic　finite　element　analyses.　The　results　are　compared　with　the　solutions　in　the　current　Section　XI,　RSE-M,　and　are　finally　cross-checked　with　the　results　obtained　from　an　independent　numerical　model.　The　results　are　useful　to　eliminate　the　discrepancy　in　trend　in　the　SIF　solutions　for　subsurface　flaws　in　flat　plates　in　the　current　edition　of　Section　XI.　Copyright　©　2024　by　ASME.