Abstract: Aiming at the widespread problem of water-accumulating in gob, based on theory of transient electromagnetic method and EH4 magnetotelluric method, through the analysis of characteristics and disadvantages of the two methods, a new method integrated two methods is proposed to detect mine water-accumulating gob, and site application is carried out. The results show that the comprehensive detection method can effectively solve the disadvantages of low accuracy and large interference by only one method, and the detection result is more reliable. This method can detect and evaluate the gob areas and their aquosity, and prevent major water bursting accidents.