Abstract: In order to Analysis a variation law of the induced polarization features of the water bearing geological structure in the mine seam gateway and to guide a d ynamic electric field method applied to an industrial trial in an underground mine ,an induced polarization mechanism of a surface polarization body was applied to analyze t he induced effect equivalent circuit of the surrounding rock medium in the mine seam gateway and to establish an equivalent resistance- capacitance network of the water bearing geological structure physical model. According to the results between the induced effect test of the simple resistance- capacitance model with the given parameters and the theoretical calculation,an optimal detection simulation test plan was determined and different scale induced effect detection process of the water bearing geological structure was simulated. The results showed that when the measuring electrode was close to a water- bearing abnormal mass,the apparent resistivity value would be stead ily reduced and the apparent amplitude frequency value would be steadily increased.When the abnormal mass scale was varied from large to smal,the apparent amplitude frequency value at the same measuring point would be reduced and the apparent resistivity value would be increased. At a location when a measuring point with a distance of 2 m to the abnormal mass,the apparent amplitude frequency measured would be varied from 11. 68% to 9.35% ,the apparent resistivity would be varied from 312. 07 Q. m to 320. 37 A:m and the apparent amplitude frequency value would be more sensitive to the scale variation of the abnormal mass.