Abstract: In order to find out the distribution extent, the condition of ponding water and the potential safety hazard in coal mine gob areas of Changzhi, it used the transient electromagnetic detection technology to detect the gob ponding areas of coal mines in Changzhi. Through the field data acquisition and processing, it made comprehensive profiles of the apparent resistivity. Combined with the detection examples, it analyzed the geophysical characteristics of coal mine gob areas, summarized the application effect of the transient electromagnetic method in Changzhi.