Water disaster is one of the main threat to roadway mining, also affects safe mining production and mining efficient. In order to find out the rich water situation of roof and board Sandstone fracture aquifer of 2113 mining face in Laomupo Mining Industry, the underground transient electromagnetic technology was adopted to delimit abnormal rich water area, the technology provided scientific data for water disaster prevention and control, ensured the safe and efficient mining of the roadway.