The purpose of this study is to estimate groundwater mineralization over a larger area by utilizing the relationship between electrical resistivity and groundwater mineralization. This is achieved by integrating geoelectromagnetic sounding data with well data to develop an estimation method that does not rely solely on water sample collection.Methods: This research uses geoelectromagnetic sounding data collected from the central and southern parts of the Bohai Bay Basin to create a three-dimensional resistivity model. This model is then combined with existing well data to delineate the stratigraphy. A groundwater mineralization estimation method is applied, which integrates resistivity with parameters like porosity and temperature to calculate mineralization levels.Results: Groundwater mineralization at a depth of 1. 755 km in the southern Huanghua Depression, the Linqing Depression in the Bohai Bay Basin, and the Xin County area was estimated. The results were compared with well data from the Xinxian area, confirming the accuracy of the estimates. The study found that the northern Cangzhou area had high mineralization values ranging from 1. 15 to 5. 31 g/L, with slow groundwater flow in a sedimentary settlement center. The Linqing Depression in Xin County showed a mineralization range of 1. 34 to 11. 9 g/L, which aligns with previously obtained regional runoff conditions.Conclusions:The study concludes that the groundwater mineralization estimation method based on electrical structure constraints is reliable and feasible. The results validate the use of geoelectromagnetic sounding data for large-scale estimation of groundwater mineralization