Abstract: The grounding electrode is an important part of the conductor earth circuit when DC bias occurs in the DC transmission system. In the case of increasing risk and severity of DC bias, the suitable site selection will significantly contribute to the suppression of DC bias. This paper presented an evaluation and optimization strategy for the selection of the grounding electrode considering the effect of DC bias. the suppression effect, investment cost, environmental impact and AC topology adaptability was taken into account as evaluation indicators, adopted the relative entropy-based combination weighting method for weight ranking, and finally selected the optimal site scheme. The new strategy comprehensively considers the influence of many factors, making the results more comprehensive and reasonable. In addition, the combined weighting method uses qualitative and quantitative calculations from both subjective and objective aspects, avoiding the limitations of the single weighting method. Finally, Yichang Power Grid was taken as an example to verify the effectiveness and reliability of the proposed method.