Based　on　the　activity　data　collected　from　various　types　of　agricultural　ammonia　emission　sources,　Beijing-Tianjin-Hebei　(BTH)　region　agricultural　ammonia　emission　inventory　in　2014　was　compiled　by　using　emission　factor　method.　The　results　showed　that　the　total　ammonia　emissions　from　agricultural　sources　in　BTH　region　were　1750695t　in　2014,　The　average　agricultural　ammonia　emission　intensity　in　the　Beijing-Tianjin-Hebei　region　was　8.09t/　km2.　Ammonia　emissions　in　Hebei,　Beijing　and　Tianjin　were　159408t,　58822t　and　97786t　respectively.　In　the　livestock　and　poultry　industry,　pigs　and　laying　hens　were　the　main　sources　of　ammonia　emissions,　accounted　for　31.29%　and　26.07%　respectively.　The　average　annual　concentration　of　PM2.5　was　decreased　12.04μg/m3　by　agricultural　ammonia　emission　reduction　of　the　BTH　region,　the　decline　was　about　18.36%.　In　April　and　July,　agricultural　ammonia　emission　reduction　had　a　greater　impact　on　PM2.5,　while　in　January　the　impact　was　minimal.　The　average　annual　concentration　of　inorganic　salt　(sulfate　+　ammonium　salt　+　nitrate)　was　decreased　10.00μg/m3　by　agricultural　ammonia　emission　reduction,　and　the　decline　was　about　18.36%.　Agricultural　ammonia　emission　reduction　had　the　greatest　impact　on　nitrate,　followed　by　ammonium　salt　and　sulfate　minimum.　©　2018,　Editorial　Board　of　China　Environmental　Science.　All　right　reserved.