Abstract: The high density resistivity method combined with radon survey is used to detect blind fault in the area of the proposed site in the project of No.1 refuse dump and barren rock transportation in Panzhihua Baima Iron Mine.The fault strike and the range of fracture zone is acquired by connecting anomaly belt on multiple lines，and predict the proneness and dip of fault by comprehensively analyzing the anomalous characters of two kinds of geophysical prospecting methods.Through the drilling test，there is an obvious fact that the comprehensive geophysical method with high density resistivity method and radon survey can detect blind fault effectively，and this combination mode also reflects the technical advantage of multi-geophysical prospecting.

Key words: High density resistivity method, Radon survey, Blind fault, Fault parameter