Abstract: The water-rich area in the goaf of overlying coal seam on the working face is identified by means of geological analysis, transient electromagnetic detection and drilling verification. Firstly, through the analysis of the hydrogeology of 9104 working face based on the existing geological data, it is determined that the main hidden water hazard is the goaf water accumulation area of 4-1 overlying coal seam; then, according to the characteristics of water hazards, appropriate geophysical methods are selected to carry out the optimal detection design; based on the detection data of return air and transport channel, this paper expounds how to draw the slice of apparent resistivity isoline of 4-1 coal seam and delineate accurately the anomalous area of water accumulation; finally, the accuracy of TEM detection results is verified by drilling. The research results show that the width of TEM detecting and controlling working face is not more than 200 m, rich data can be obtained within 60 m height of the roof, and the blank zone becomes wider and wider with the increase of the height; multi-angle direction design can be used to obtain more data of line direction, which is helpful to draw the result slice map, according to the relative apparent resistivity value, the goaf water accumulation area in overlying 4^-1 coal seam is qualitatively evaluated, the distribution range of water accumulation area is ascertained.