Abstract: The high density resistivity method is used to explore and investigate the local area of mine slope to find the hidden fault and lithologic weak layer which may affect the stability of mine.Considering the special exposed bedrock surface,the collecting device of high density resistivity method is improved.Based on the analysis and verification of related geological data,the exploration has achieved good results,thus providing reliable geological basis for the slope stability calculation,analysis and evaluation as well as subsequent related management measures.In addition,the exploration also has proved that the high density resistivity method is of good effects in the exploration of unfavorable geologic bodies of mine slope.Meanwhile,this research also has verified the accuracy of improved device and that the device is advantageous to overcome the influence of high resistivity body on the surface and improve the field work efficiency.The device can be applied to other work areas similar to the bedrock exposed surface,such as urban road.