Abstract: Nitrogen in the atmospheric environment caused by human activities returns to terrestrial and aquatic ecosystems in a form of dry/wet deposition, which may causes a series of negative ecosystem effects. This paper studied the dynamic characteristics of atmospheric nitrogen deposition in the Danjiangkou Reservoir area based on the continuous monitoring data of atmospheric dry and wet nitrogen deposition from 2016 to 2018. The results indicated that : ① The average annual fluxes of TN, AN, NN, and DN in atmospheric wet deposition from 2016 to 2018 were 29.48, 10.75, 11.27, and 24.52 kg/(hm2·a), and the wet deposition fluxes of TN, AN, NN and DN were the highest in summer, accounting for 32.85%, 43.94%, 26.74%, 33.59% of the total wet deposition fluxes of different forms, respectively. ② The dry deposition fluxes of TN, AN, NN, and DN were 8.38, 1.56, 1.26, 5.77 kg/(hm2·a) respectively, and had the following temporal orders: winter>autumn>spring>summer. ③ From 2016 to 2018, the total atmospheric nitrogen deposition in the reservoir area was 37.86 kg/(hm2·a). Among them, the TN dry and wet deposition fluxes accounted for 22.13% and 77.87% of the total deposition, respectively. The study of atmospheric nitrogen deposition process and flux can better reveal the contribution of atmospheric nitrogen deposition to the input of nutrients in the reservoir area, enrich the understanding of the “nutrient source” of water body in the Danjiangkou reservoir, and also fundamentally strengthen nitrogen management in the reservoir area.