The　growth　of　population　and　changes　in　dietary　structure　have　led　to　a　continuous　increase　in　demand　for　livestock　and　poultry　products,　resulting　in　the　increase　of　the　gaseous　reactive　nitrogen　(GNr)　emissions　from　livestock　and　poultry　breeding　systems　and　posing　a　threat　to　the　human　and　ecosystem　health.　The　characteristics　from　GNr　emissions　of　six　livestock　and　poultry　breeding　systems　at　the　provincial　level　of　China　in　2020　were　evaluated　with　the　framework　of　life　cycle　analysis.　Additionally,　this　study　explored　the　impact　of　silage　maize　replacing　traditional　maize　as　feed　on　reducing　GNr　emissions.　The　GNr　emissions　from　producing　1　ton　of　beef　were　the　highest,　approximately　9　times　higher　than　those　from　producing　1　ton　of　milk.　The　GNr　emissions　for　production　of　1　ton　of　pork　and　egg　were　the　biggest　in　Zhejiang.　And　the　biggest　emissions　for　1　ton　of　beef,　mutton,　chicken　and　milk　production　were　in　Xizang,　Shaanxi,　Guangdong,　and　Guangxi,　respectively.　The　total　GNr　emissions　from　pork　production　were　highest.　Compared　with　other　stages,　the　stages　of　manure　management　and　feed　production　contributed　the　majority　of　GNr　emissions.　Assuming　that　all　the　feed　crops　required　for　the　production　of　livestock　and　poultry　products　in　2020　were　locally　grown,　the　total　GNr　emissions　from　the　production　of　livestock　and　poultry　products　of　China　in　2020　were　6143.94　kt　N,　indicated　that　local　emissions　in　China　only　accounted　for　57.90%.　Moreover,　when　the　substitution　rate　of　silage　maize　reached　100%,　the　GNr　emissions　from　livestock　and　poultry　breeding　systems　would　be　reduced　by　10.05%　(324.98　kt　N).　This　study　provided　a　detailed　and　spatial　overview　of　the　GNr　emissions　in　livestock　and　poultry　production　in　China,　which　could　support　reducing　GNr　emissions　in　livestock　and　poultry　breeding　systems　for　decision-makers　and　air　pollution　control.