Abstract: The geological hazards by abandoned coal mine woring in Mentougou region is very serious. In this region, high-resolution earth resistivity method has been used to detect the old mined out area. In the works, according to reality geology condition, the devices is reasonably distributed. The effects of surface conductivity inhomogeneity is rejected by means of statistic average. The data is processed with pseudosection of apparent resistivity. And the drilling holes show that the method is very effective for geology, and it will be widely used in the future.