Abstract: In order to understand the flux of inorganic nitrogen deposition in Dalian bay, the atmospheric dry deposition in the Dalian bay area was sampled and analyzed in 2014. The atmospheric wet deposition was sampled and analyzed in 2016. The inorganic nitrogen dry deposition flux in the Dalian bay area was estimated through model analysis. The results showed that the inorganic nitrogen dry deposition flux into the sea was 46.4 tons/year, the highest concentration of inorganic nitrogen in aerosol was 15.5 g/m³, and the minimum was 0.589 g/m³.The inorganic nitrogen concentration in aerosol was 6.60 g/m³ in spring, which was the largest in the whole year;, the concentration was 5.59 g/m³ in summer, which was the lowest level in the whole year. The average wet deposition total inorganic nitrogen flux in Dalian bay was 134.64 tons/year, the highest month was September, and the average was 35.86 tons. The lowest month was November, 0.53 tons. Wet deposition flux was about 3 times of dry deposition flux, and dry and wet deposition inorganic nitrogen flux accounted for 1.9% of the total inorganic nitrogen flux in Dalian bay.