The　calculation　method　of　aviation　emissions　based　on　time　spent　in　various　modes　in　LTO　cycles　was　improved.　The　effective　emission　height　was　calculated　based　on　AMDAR　data,　instead　of　using　the　height　(915m)　proposed　by　ICAO.　Then,　the　total　amount　of　atmospheric　pollutant　emissions　from　aviation　was　estimated　accurately.　The　total　emissions　of　NOx,　CO,　HC,　SO2　and　PM2.5　from　aviation　in　Beijing　Capital　International　Airport　(BCIA)　were　about　7042.1,　3189.9,　295.3,　429.4　and　150.4t,　respectively.　As　compared　with　the　traditional　method　based　on　LTO　cycles,　the　result　estimated　with　the　improved　method　revealed　that　emissions　of　NOx,　CO,　HC　and　SO2　had　increased　by　23.5%,　2.3%,　2.1%　and　18.1%,　severally.　Monthly　emissions　of　CO,　HC,　SO2　and　PM2.5　from　aircraft　in　BCIA　presented　a　relatively　steady　trend,　but　NOx　was　fluctuated　on　a　large　scale.　Emissions　from　aviation　were　lower　in　January　to　February;　and　monthly　emission　was　peaked　in　August.　Moreover,　as　for　different　operation　modes,　the　climbing　and　taxiing　course　were　found　with　the　largest　emission.　Approximately　37.7%　and　36.8%　of　the　total　aircraft　emissions　were　produced　in　climbing　and　taxiing,　respectively.　©　2016,　Editorial　Board　of　China　Environmental　Science.　All　right　reserved.