The　formation　of　numerous　micelles　by　naphthalene　superplasticizers　(NS)　in　alkaline　solutions　reduces　their　dispersion　efficiency　within　alkali-activated　slag　(AAS)　pastes.　Enhancing　the　solubility　and　diffusibility　of　NS　can　improve　the　workability　of　AAS　pastes.　In　this　study,　Lewis　acids　are　introduced　to　regulate　the　rheological　properties　of　AAS　pastes　in　the　presence　of　NS.　The　results　indicate　that　barium　nitrate　(Ba(NO3)2),　as　a　type　of　Lewis　acid,　exhibits　a　strong　synergistic　effect　when　combined　with　NS　to　enhance　the　workability　of　AAS　pastes.　This　improvement　is　primarily　driven　by　the　reaction　of　Ba2　+　with　SiO(OH)3-　in　the　waterglass　solution,　which　decreases　the　degree　of　hydrogen　bonding　among　water　molecules　and　lowers　the　concentration　of　unsaturated　silicic　acid　groups.　Additionally,　Ba(NO3)2　prolongs　the　setting　time　of　AAS　pastes　and　does　not　affect　the　mechanical　strengths　of　AAS　cement　mortar　at　28　days.