Abstract: We use nuclear magnetic resonance（NMR） technology to analyse the pore structure of sandstones in the Luohe Formation.T₂ relaxation time distribution data were obtained from NMR measurements, and the mathematical relationship between T₂ time and pore radius was established, providing a theoretical basis for understanding the sandstone pore structure.The results of the study of the pore structure of sandstones of Luohe Formation in the Xunyao Mining Area show that the large pore structure is favourable for fluid transport, while the small pore structure may hinder the flow.The bimodal sandstone pore structure mixes large and small and medium-sized pores, with high porosity, connectivity and permeability; while the monomodal sandstone has a single pore structure and low permeability.The high agreement between the NMR porosity and the water-measured porosity indicates that the NMR technique has potential in assessing the pore structure characteristics of sandstone aquifers, which provides data support for rock microstructural analyses, aquifer assessment, and pore heterogeneity study.