With the construction of ultra-high voltage transmission lines in China, the risk of GIC(geomagnetically induced current)impact on power grid construction will be greatly increased. Based on the ground resistance model, the finite element method is used to calculate the GMD (geomagnetic disturbance). The modeling is complex, the cost of calculating the induced geoelectric field by the finite element method is too high. The apparent resistivity obtains from geomagnetic bathymetry data reflects the electrical structure of the earth. A method for directly calculating the GMD geomagnetic induction geoelectric field based on the apparent resistance data and the measured data from geomagnetic stations is presented. The simulation results show that this method can greatly shorten the calculation time and reduce the calculation cost, and it provides an effective algorithm for China's power network to cope with geomagnetic storm. The results show that the influence of geomagnetic storms on geoelectric fields is uneven, which is closely related to the local geoelectric structure. Meanwhile, the North-South trend of the power grid will produce larger GICs and be more vulnerable to geomagnetic storms, which should be the main object of concern.