In order to clarify the Nuclear Magnetic Resonance(NMR) characteristics and influencing factors of gas-water layer of He₈ member in southeast Sulige of Ordos Basin, two-dimensional NMR technology was used to characterize the gas-water layer characteristics, combined with the analysis results of formation water, reservoir physical properties, formation anisotropy and gas supply, the NMR response characteristics of the gas-water layer of He₈ member in the study area were clarified. The relationship between formation water, pore type, pore throat structure, formation anisotropy, gas supply and reservoir gas bearing is analyzed. The results show that: ①The formation water in the study area is mainly CaCl₂ type, but the salinity difference is strong, and the distribution is 3669~325000 mg/L. The water type is all CaCl₂, the pH value is 4.21~8.98, and it is weakly acidic.[r(Na⁺)/r(Cl^-)] was less than 0.61, the coefficient of chloride to magnesium[r(Cl^-)/r(Mg²⁺)] was greater than 7.0, and the coefficient of magnesium to calcium[r(Mg²⁺)/r(Both Ca²⁺)] are less than 0.69, and the metamorphic coefficients[r(Cl^--Na⁺)/r(Mg²⁺)] are more than 0.47, indicating that the formation water is in a relatively stagnant reduction state, the formation is strongly sealed, and the natural gas is well preserved. ②The distribution of gas-water layers in He₈ member in the study area is complex, and two-dimensional nuclear magnetic resonance technology can effectively distinguish the gas-water layers. ③The pore types of the reservoir in He₈ member are mainly residual intergranular pores and feldspar solution pores, with porosity ranging from 2.70% to 14.48% and permeability ranging from 0.04 to 15.92×10^-3 μm². The reservoir physical properties affect the gas bearing properties of the reservoir, and the porosity and permeability of the reservoir are greater than 7.0% and 0.2×10^-3 μm², respectively. The porosity and permeability of the gas-bearing and differential gas layers are 5%~9.5% and (0.02~0.7)×10^-3 μm², respectively, while the porosity and permeability of the dry layer are less than 5% and 0.1×10^-3 μm², respectively. The anisotropy of the gas layer is between 15%~20%, and that of the dry layer is less than 6%.