Three-dimensional seismic exploration survey in goaf was a difficult in additional exploration in coal mine, such as SNR gap of seismic data; effective reflection wave was not obvious and not easy to get valid data. Taking 9400 mining area in west well of Dongpang Mine and 9500 mining area of Xipang well as examples, geological findings and high quality seismic data under widespread mined-out area were obtained with this technology first in China, not only delimitated range of No.2 coal goaf, but got relevant information of No.9 coal seam successfully through goaf, predicted water abundant area and structure of limestone of Ordovician system, which effectively guided running grouting reconstruction project in Ordovician limestone area.