We　study　theoretically　the　construction　of　topological　conducting　domain　walls　with　a　finite　width　between　AB/BA　stacking　regions　via　finite　element　method　in　bilayer　graphene　systems　with　tunable　commensurate　twisting　angles.　We　find　that　the　smaller　is　the　twisting　angle,　the　more　significant　the　lattice　reconstruction　would　be,　so　that　sharper　domain　boundaries　declare　their　existence.　We　subsequently　study　the　quantum　transport　properties　of　topological　zero-line　modes　which　can　exist　because　of　the　said　domain　boundaries　via　Green’s　function　method　and　Landauer—Büttiker　formalism,　and　find　that　in　scattering　regions　with　tri-intersectional　conducting　channels,　topological　zero-line　modes　both　exhibit　robust　behavior　exemplified　as　the　saturated　total　transmission　Gtot　≈　2e2/h　and　obey　a　specific　pseudospin-conserving　current　partition　law　among　the　branch　transport　channels.　The　former　property　is　unaffected　by　Aharonov—Bohm　effect　due　to　a　weak　perpendicular　magnetic　field,　but　the　latter　is　not.　Results　from　our　genuine　bilayer　hexagonal　system　suggest　a　twisting　angle　around　θ　≈　0.1°　for　those　properties　to　be　expected,　consistent　with　the　existing　experimental　reports.　[Figure　not　available:　see　fulltext.]　©　2022,　Higher　Education　Press.