Per-　and　polyfluoroalkyl　substances　(PFAS)　can　persist　and　continuously　affect　the　environment　because　of　their　innate　thermal　and　chemical　stability.　The　cut-off　wall　has　emerged　as　a　new　and　promising　technology　for　pollution　control　at　contaminated　sites.　This　paper　aims　to　investigate　the　migration　of　perfluorooctanesulfonic　acid　(PFOS)　and　perfluorooctanoic　acid　(PFOA)　in　a　cut-off　wall,　aquifer　and　aquitard　triple-domain　system　based　on　numerical　simulation.　The　impacts　of　the　PFAS　concentration　distribution,　nonlinear　and　rate-limited　adsorption　and　cut-off　wall　type　are　considered.　The　results　show　that　the　cut-off　wall　adsorption　coefficient　(Kdc)　has　the　most　considerable　effect　on　system　performance.　Direct　breakthrough　rather　than　back-diffusion　is　the　dominant　failure　mode　when　the　Kdc　values　for　PFOS　and　PFOA　are　lower　than　15.4　mL/g　and　7.8　mL/g,　respectively.　The　GCL-enhanced　cut-off　wall　(GCLW)　is　more　suitable　for　installation　than　the　composite　GMB　cut-off　wall　(GMBW)　when　the　hole　radius　exceeds　1　m.　Additionally,　the　GMBW　is　more　effective　at　reducing　the　peak　contaminant　concentration　than　the　GCLW　when　the　head　loss　is　＞　1.9　m.　This　study　may　provide　a　scientific　basis　for　the　selection,　installation　and　maintenance　of　cut-off　walls　under　different　conditions　at　PFAS　contaminated　sites.　©　2025　Elsevier　B.V.