This　study　analyzes　the　durability　of　brick-faced　clay-core　walls　(BCWs)　in　the　traditional　residential　architecture　of　Quanzhou—a　UNESCO　World　Heritage　City.　Taking　the　northern　gable　of　Ding　Gongchen’s　former　residence　as　an　example,　the　mechanical　properties,　microscopic　structure,　and　changes　in　chemical　symbol,　oxides　and　minerals　of　the　red　bricks　and　clay-cores　were　analyzed　using　finite　element　mechanics　analysis　(FEM),　scanning　electron　microscopy　(SEM),　X-ray　fluorescence　(XRF),　and　X-ray　diffraction　(XRD).　The　results　indicate　a　triple　mechanism:　(1)　The　collaborative　protection　and　reinforcement　mechanism　of　＇brick-wrapped-clay＇.　(2)　The　infiltration　and　destruction　mechanism　of　external　pollutants.　(3)　The　material　stability　mechanism　of　silicate　minerals.　Therefore,　the　key　to　maintaining　the　durability　of　BCWs　lies　in　the　synergistic　effect　of　brick　and　clay　materials　and　the　stability　of　silicate　mineral　materials,　providing　theoretical　and　methodological　support　for　sustainable　research　into　brick　and　clay　constructions.　©　2025　by　the　authors.