Abstract: In order to quantitatively explain the wet removal process of NH₃, GR model was used to simulate the wet removal process of NH₃ under many situations. The results show that the most important factors of affecting the wet removal process of NH₃ are liquid water content and rain density. NHa plays an important role in acid rain, which can increase the pH value of cloud water and rain water, and speed the dissolution of SO₂ in water and the oxidation of S （IV） by O₃, thus speed the wet removal process of NH₃. The results also show that the wet removal rate of NH₃ is 52%·h-1 under typical situations.