In order to ensure the safe mining of the 21209 working face of Dongpan Mine and provide a reference for the formulation of water prevention and control technical measures, first of all, it was necessary to find out the water richness of the rock formations within the working floor and surrounding areas and the hidden water-conducting structures in the working face. Transient electromagnetic technology, Wenner's three-level electrical sounding technology, radio wave tunnel perspective and audio electrical perspective comprehensive geophysical exploration methods were adopted, for the hidden conductance and water-containing structures inside the working face, especially the hidden water-conducting sinking columns, faults and dense development zones probing. The results showed that there were three relatively low-resistance anomalies in the detection range, of which the S1 and S2 anomalies were rock-cutting and water-bearing reactions near the wild limestone, and the YP1 anomaly was a local water-rich reaction in the rock formation; two geological anomalies, KT1, KT2 analysis. It was a hidden geological structure. The water-rich condition of the coal and rock formations within the detection range of the 21209 working face was ascertained, and the expected purpose was achieved.