Chloroform (CHCl₃) and bromoform (CHBr₃), two important volatile halogenated hydrocarbons (VHCs), are trace greenhouse gases and ozone-destroying substances that play an important role in global climate change. In this paper, Suaeda glauca, a dominant species in the Yellow River Delta, was subjected to pot experiments to investigate the effects of different nitrogen additions (CK, control, 6.0 g N m^-2 a^-1; 1.5N0, low nitrogen treatment, 9.0 g N m^-2 a^-1; 3.0N0, high nitrogen treatment, 18.0 g N m^-2 a^-1) on its and its microecological CHCl₃ and CHBr₃ flux characteristics. The results showed that CHCl₃ and CHBr₃ fluxes decreased first and then increased at different nitrogen gradients. CHCl₃ release was promoted at low concentration of 1.5N0, but inhibited at high concentration of 3.0N0. The peaks of gas fluxes of CHCl₃ and CHBr₃ in Suaeda glauca appeared during its withering and seedling stages, respectively. The main reason was that nitrogen addition stimulated the balance between gas consumption and production, as well as changed in growth factors during different growth stages of plants. According to the correlation analysis, the CHCl₃ flux of Suaeda glauca was affected by the interaction of many factors. There was a significant correlation between the root length of the plant and the CHBr₃. The longer the root, the lower the CHBr₃.There were different change trends of CHCl₃ and CHBr₃ in the potted micro-ecosystem under different nitrogen gradients. CHCl₃ increased first and then decreased, while CHBr₃ decreased first and then increased. The highest and lowest values of gas fluxes appeared in different growing plants period. The gas flux of the potted micro-ecosystem was mainly affected by the interaction of soil NH₄⁺-N, NO₃^--N and plant litter.