Abstract: The main task is water-proof in Lincheng coal mine of exploring the way of mining the hypo-group coal. Audio-Frequency electrical perspective is the main technology of geophysical technique. In this paper,with the emphasis on introducing the detection effect by Audio-Frequency electrical perspective in Lincheng coal mine, the author believe that this technique not only is a most effective geophysical method for detecting the water-conductive structures in roof or floor,but also is important method in exploring the way of mining the hypo-group coal.