Under the action of current, DC grounding electrode will affect the surrounding environment to increase ground potential, especially the problem of accelerated corrosion of buried metal and other components. The grounding theory research shows that the surface potential problem in the near area of the DC grounding pole can be regarded as the transfer potential solving problem. Since the current of DC ground electrode to ground is known, solving the surface potential problem will be transformed into a problem of finding the transfer resistance near the DC ground electrode. In order to obtain the near-zone transfer resistance of the DC grounding electrode, it is necessary to propose a method for calculating the near-zone surface potential with higher accuracy. In this paper, the $R_{T}$ integration formula of DC grounding near-zone transfer resistance under the horizontal stratified geodetic model is converted into a double integration form, and the numerical calculation method of the frequency $\lambda$ domain transfer function F for the frequency and frequency domain of the horizontal stratified geodetic model is given. By converting the algorithm of transfer resistance from the Hankel integral to a finite integral in the range of [$0,\pi$], the solution accuracy of the transfer resistance near the DC ground electrode can be improved and the calculation difficulty can be reduced.