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The DC ground electrode is an important part of the DC transmission project. The distribution of the soil resistivity around it directly affects the parameter design and operation and maintenance of the ground electrode. In order to ensure the normal operation of the ground electrode and avoid affecting the personal safety and equipment performance near the ground electrode, it is necessary to test and model the soil resistivity around the ground electrode. In this paper, the quadrupol method and the magnetotelluric sounding method are used to test the soil resistivity around the ground electrode. The results obtained by these two test methods are compared, and the respective advantages and disadvantages of these two methods in soil resistivity testing are comprehensively analyzed. The soil resistivity is modeled by the inversion software independently developed by our team. Finally, the grounding resistance value calculated according to the soil model is in good agreement with the reference value, which verifies the reliability and accuracy of the method.