Abstract: The paper introduced the common working device and the theory of underground whole space and half space transient electromagnetic method. Combined with the hydrogeological condition and mining condition of a mine, 1136 and 1138 working face was detected by TEM in order to define the goaf water and overburden rich water, and the 1136 working face was also detected by UWTEM. The detection indicated that the results of TEM and UWTEM were almost identical, and the location, distribution range and water accumulation situation of the abnormal areas were found. According to the location of abnormal areas, 22 bore holes were drilled and 16 bore holes had water outflow, which indicated that the two lower resistivity areas were sandstone aquifer.