Sound　is　one　of　the　important　environmental　factors　that　influence　individuals＇　decision-making.　However,　it　is　still　unclear　whether　and　how　natural　sounds　nudge　green　product　purchases.　This　study　proposes　an　extension　of　the　Stimulus-Organism-Response　(S-O-R)　framework,　suggesting　that　natural　sounds　increase　early　attentional　congruency　associated　with　green　products,　thereby　promoting　individuals＇　green　product　purchases.　To　test　our　theory,　we　conducted　an　experiment　employing　a　hierarchical　drift-diffusion　model　(HDDM)　and　utilized　an　event-related　potentials　(ERP)　method.　Results　showed　that　natural　sounds　not　only　increased　the　purchase　rate　for　green　products　but　also　enhanced　drift　rate　in　favor　of　purchasing　green　products.　Additionally,　consumers　also　exhibited　a　reduced　frontal　early　P2　wave　(150-230　ms)　in　response　to　green　products　under　natural　sounds,　indicating　that　natural　sounds　increased　the　early　attentional　congruency　associated　with　green　products.　More　importantly,　neural　correlates　of　early　attentional　congruency　meditated　the　nudge　effect　of　natural　sounds　on　purchase　rate　and　drift　rate　for　green　products.　This　study　contributes　to　the　neural　understanding　of　how　natural　sounds　influence　green　product　purchases　and　provides　actionable　implications　for　market　managers　to　design　the　green　products　sales　environments.