Y484 working face of Tangshan Mine was taken as example, mine transient electromagnetic method was adopted to detect roadway and wind roof and floor 50 m, water rich in surface coal seam was analyzed and studied, the result showed that the working face roof belongs to permeable stratum, floor was water-resistant stratum, with small water-rich abnormal area, low resistance anomaly area did not cut through in vertical direction, with little existence possibility of water diversion structure.