Abstract: The paper focuses on simulating the forward modeling of steady electric currents down the hole by means of finite element method systematically. Firstly, the boundary values and variable problem of the electric field caused by a point source in 3D models of full space are given. Fixed electric point source in roadway was simulated in roadway. The influence of roadway space on the distribution of full space steady electric field was studied through influencing factors of roadway. The results of numerical simulation indicate that the roadway influences are related to the geometrical dimension of roadway, the location of current electrodes and the conductivity of surrounding rocks.