Abstract:Watery zones adjacent to coal seams are seriously imperiling coalmine’s safety in production. In 1171 roadway of mining process, in front of a content was significantly increased, in order to avoid the water disaster, the whole working face to carry out transient electromagnetic measurement work. The results of the ground and underground transient electromagnetic field are the same, and the results are the same for the rich water area. The combined detection reduces the problem of multi solution of geophysical prospecting data. It can greatly improve the exploration precision. It can improve the reliability of the coal mine prevention and control.