Several 1D/3D and 2D/3D models were designed for numerical simulation. The authors analyzed the applicability of the three dimensional geological model by using the two-dimensional inversion interpretation method from two aspects, i.e., the difference between the model's 3D response and 2D response and the contrast of the results. Some conclusions have been reached: If the abnormal body is gradually shortened along the length of the strike, the model's three-dimensional characteristics gradually increase. The 2D inversion results using TM polarization mode remain basically unchanged, and the 2D inversion results of TE polarization mode gradually produce distortion, indicating that TM polarization mode has much lower 2D model requirements than TE polarization mode. The effect of 2D inversion of TE/TM mode is usually between the effect of the above two modes, and sometimes better than the two-dimensional inversion result of TM polarization mode. It is concluded that the 2D inversion using TM polarization mode under normal conditions can usually reconstruct original model well, and in the case that the overall electrical characteristics of TE/TM mode inversion results are similar to those of TM polarization mode, the model resistivity value of TE/TM mode inversion result is superior to that of the TM polarization mode.