Since the cutoff of Jinci Springs in 1994, a large amount of people eagerly hoped that these ancient and famous springs could regain their former demeanours, and therefore the Jinciquan reflow project was put on the agenda. Mingxiangou is located on the northwest side of Jinci Spring and is one of the most important research areas for the reflow project. Therefore, identifying the geological structure and hydrogeological conditions in key areas, determining the best karst water replenishment sites and methods, and realizing the effective recharge of karst groundwater resources have become important topics of this project. Geophysical method is an important means to study this topic. Audiomagnetotelluric method has good effects in detecting the structural characteristics of deep and large faults, the basement structure and its influence range. High-density electrical method is sensitive to shallow secondary fractures within 150m, groundwater level, bedrock surface and karst development. The charging method is effective in determining the flow direction and flow rate of the groundwater, and finding out the water connection between Mingxiangou and Jinci Spring. According to the characteristics of the three geophysical methods and the actual situation of the survey area, the strategy of joint exploration of the above three geophysical methods was established. The main deep and shallow fault structures shown by the audiomagnetotelluric method and high-density electrical method inversion resistivity profiles are in good agreement with the 1:50000 geological map in this area. The Bianshan fault response is obvious and the location and tendency of which are clearly defined; The consistency of the same geological body in different profiles of high-density electrical method increases the credibility of the interpretation; Meanwhile, the comprehensive exploration of the three geophysical methods shows that there is a good hydraulic connection between Mingxianou and Jinxi Spring, which lays a theoretical foundation for the ecological water replenishment project in the area.