Abstract: In order to effectively detect the development of water damage in the working face floor and ensure the safety of mining, three-dimensional finite element method of borehole resistivity method is used to carry out forward simulation for the model of typical water-bearing abnormal body. In this paper, three-dimensional finite element forward modeling theory of the whole space is studied, the potential distribution rules of different types of devices are analyzed, the geo-electric models of fault, collapse column and goaf are established, and the three-dimensional finite element forward modeling is carried out, and the potential distribution of different geologic abnormal body models is studied. The simulation results show that the potential distribution is characterized by sparse in low resistance region and dense in high resistance region, and the potential gradient is characterized by the law that the low resistance region becomes smaller and the high resistance region becomes larger. It is more close to the target body to detect the floor water damage by borehole resistivity method. The simulation effect of 3D forward modeling is good.