The northeastern Tibetan Plateau (NETP) is the most intensely uplifted deformation region in the Tibetan Plateau. The intense gas release caused by uplift has attracted widespread attention. In this study, we measured the soil gas concentrations (Rn and CO₂) and CO₂ fluxes from active faults and analysed the seismic tomography in the arcuate structure zone of the NETP. The results reveal that the concentrations and fluxes of Rn and CO₂ in the south area are higher than those in the north area. Factors such as rock types, meteorological conditions, and seismicity have limited influence on soil gas emissions. Instead, the uplift of the upper crust in the Tibetan Plateau plays a crucial role in determining the distribution of soil gases. Regions with high crack density (ε), saturation rate (ξ) and Poisson's ratio (σ) in the upper crust show stronger release, such as the epicenter of the Haiyuan M_S 8.5 earthquake. The convergence zone of the arcuate structure zone with high crust uplift velocity is an intense release area with a rough total CO₂ output of ∼1.10 Mt.·yr⁻¹. This output is twice the annual CO₂ output of the Wenchuan M_S 8.0 earthquake rupture and one-fifth of the annual CO₂ output of Amiata volcano, Italy.