Abstract: The phenomenon of roof watering exists in 8506 working face of Jinhuagong mine. In order to ensure safety in production, transient electromagnetic method and direct current method are used for advanced detection, and drilling water in the same layer and overlying layer. The results show that the apparent resistivity in the roof direction is low, the sandstone aquifers are locally rich in water, the other exploration directions have no obvious electrical anomaly, and the water-bearing capacity of coal and rock is poor The drainage holes were constructed in 2506 roadway, 5506 roadway, 8506 side cut roadway, 8504 goaf in the same floor and 8 goaf in the overlying No.3 layer to verify the water accumulation. The exploration method of geophysical exploration + drilling is time-saving and efficient.