Abstract: High density resistivity method is one of the most important techniques of exploration of goaf and underground water.Besides that,it is the one that is combined with the electric sounding and electrical section.Furthermore,it has the advantages of low cost,high efficiency,rich information,easy to explain and high precision.In view of the specific situation of a magnetite,the rock stability of underground goaf is detected and analyzed by adopting the high density resisitivity method.The sections are detected by using the Wenner Schlumberger device.Research of two-dimension inversion of the high density resisitivity datas are conducted effectively by combining with the Res2dinv software.According to the research results,it is concluded that,the stability of Underground surrounding rock is so good that there is no need to take some measures to fill the goaf.In addition,the factors that affect the accuracy of detection of the high density resistivity method are discussed in depth.

Key words: High density resistivity method, Surrounding rock of goaf, Resistivity