Abstract: In order to improve the prediction accuracy of various small geological structures, an experiment study on the geophysical exploration with the electrical met hod,seismic wave method and the combined method was conducted in the underground mine at the south part of Qinshui Coalfield. Based on one successful practices of a mine as a case,the paper introduced the implementation process and the explanation method of the comprehensive geophysical exploration. The great practice and study r. esults showed that the rational explanation of the geophysical exploration information should be based on the analysis on the geological mining information and strata phys ical property features. The prediction accuracy of the single electric method and the seismic wave method was low. As for the detection of the hidden small sinkhole,the mi ne transient electromagnetic method and mine seismic wave pilot prediction combined technology applied could effectively avoid the multi explanation of the geophysical e xploration information and improve the detection accuracy. In the quasi cross section image of the apparent resistivity from the transient electromagnetic method,the waterl ess sinkhole would be somewhat similar to an annular and the resistance value of the waterless sinkhole would be higher than the normal rock mass near by. In the depth migration cross section image of the mine seismic wave pilot detection,the sinkhole would have obvious reflection and location error would be less small.