Abstract:The Transient Electromagnetic Method (TEM), as an efficient geophysical exploration technique, has been widely applied in geotechnical surveys. For the voids formed during the deep mining of phosphorus ores, their unique geoelectrical properties provide ideal conditions for the application of TEM. The TEM technology is used to precisely locate the position and shape of the voids and to assess their association with water-rich fractured zones. Integrated with geological data, an in-depth comprehensive analysis has been conducted on the distribution range, water accumulation, and other conditions of the voids and karst water-rich areas. This provides a scientific reference for the survey of concealed disaster factors in phosphorus ore voids, and offers new technical means and theoretical support for the geological feature assessment and hazard identification of phosphorus ore voids, thereby providing a scientific foundation for the safe operation of related engineering projects.