Abstract： As a water conservation area in the Horqin agro-pastoral ecotone, Naiman Banner boasts strontium and metasilicic acid-rich groundwater, which provides opportunities for groundwater health research and mineral water development. This study selected the southern mountainous area of Naiman Banner, Inner Mongolia, as the target area. Based on hydrogeological surveys and test data from 37 groups of groundwater samples, hydrogeochemical analysis methods were employed to reveal the spatial differentiation patterns and formation mechanisms of strontium-rich and metasilicic acid groundwater. Results indicated that the groundwater in the study area is neutral weak alkaline, with HCO3-Ca as the main hydrochemical type. The strontium content ranges from 0.24 to 1.83 mg/L, and the metasilicic acid content ranges from 14.9 to 29.9 mg/L. The strontium rich metasilicic acid composite groundwater is distributed around the Maifanshi mining area in the area. The weathering and dissolution of carbonate rocks and silicate rocks, as well as the alternating adsorption of cations, promote the enrichment of strontium in groundwater. Indoor experiments have shown that the leaching of vermiculite is beneficial for the formation of metasilicic groundwater. The study also indicates that the pore fissure aquifer in the area has the potential for industrialized development of strontium and metasilicic acid-rich mineral water, providing scientific basis for rural revitalization and coordinated utilization of geological resources.