This paper studies the visualization processing for the detect result of underground magneto fluid detection method, and the mapping method is presented. In this paper, it uses normalization, the finite element analysis and interpolation to process the data, and then into a graphic. Groundwater and underground fissure, the cross section of the base profile is represented by different colors, thus it realizes the visualization processing for the detect result of underground magneto fluid detection method, and seeks out a new diverse interpretation and display methods, improves and perfects the underground magneto fluid detection method.