Abstract: In order to detect the goaf of Gongchangling open-pit accurately，the comprehensive geophysical prospecting method based on high density resistivity method and transient electromagnetic method is proposed.Firstly，according to the high density resistivity method，the low resistance model and high resistance model of single goaf and double goaf under all kinds of geological conditions based on the detection data obtained by the devices of wenner，dipole array and unilateral tertiary，the goaf of Gongchangling open-pit distributed densely in horizontal and vertical direction is detected by conducting contrast analysis of the resistivity difference;secondly，based on transient electromagnetic method，the geological and geophysical recognition model of the same geological body are established by utilizing the devices of coincident loop，central loop，separate loop and ground loop，and the location and scale of the goaf of Guangchangling open-pit are detected accurately by observing the variation information of the transient magnetic field structure and frequency along with time and space；finally，in order to detect the information of location，scale and roof thickness with high precision，the comprehensive detection data of high density resistivity method and transient electromagnetic method are processed and interpreted comprehensively combing with the field actual geological conditions.The cross-section diagram and floor plan of the goaf of Gongchangling open-pit are obtained.The detection results show that 3 shallow goafs and 2 deep goafs are detected in Gongchangling open-pit，so it can be further indicated that the integration of comprehensive and advantages of detecting technologies is realized by the organic combination of high density method and transient electromagnetic method.It is good to conduct the detection of goaf with high precision.

Key words: Goaf, Comprehensive geophysical prospecting method, Accurate detection, High density resistivity method, Transient electromagnetic method, Comprehensive interpretation