The emissions of air pollutants from six typical airports in North China in 2017 were estimated using an improved method, which considered the mixing layer height calculated based on aircraft meteorological data relay (AMDAR) and improved the actual operation times of the aircraft under different modes. The total emissions of NO_x, CO, VOC, SO₂ and PM_2.5 of the six airports were 21504.2, 7074.8, 1424.0, 1283.6 and 323.2t, respectively. The emissions of NO_x, CO, VOC and SO₂ from aircraft were much larger than the other emission sources in the airport, while the emission contributions of PM_2.5 were similar. The HC and CO were mainly emitted during the taxi process, accounting for 90.6% and 90.2%, respectively. The NO_x、SO₂ and PM_2.5 were mainly emitted during the climb process, accounting for 58.9%,38.7% and 43.5%, respectively. The emissions of six airports in January were relatively lower than that in other months, and the largest emissions were occurred in August. Based on the detailed emissions inventory of the airports developed in this study, a WRF-CMAQ modeling system was applied to investigate the impact of the Tianjin Binhai International Airport emissions on the PM_2.5 concentration in the surrounding regions. The results indicated that the hourly maximum concentration contribution was 3.24μg/m³ in the airport area, The annual average and hourly maximum concentration contributions to the grids which were 5km away from the airport were 0.08 and 2.84μg/m³, respectively.