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The calculation formula for divergence of DC grounding current was put forward. The divergence of DC grounding current at different directions in the earth was studied. The main factors include the pattern of electrode, distance between sending end area and receiving end area, earth structure, etc. Some important conclusions were discovered. When observation point is close to DC grounding electrode, the pattern electrode has a big effect on the divergence of DC grounding current. When observation point is far from DC grounding electrode, soil structure has an effect on the divergence of DC grounding current. When the distance between DC grounding electrodes in the sending end area and receiving end area is short, the interaction of two electrodes should be considered.

With the rapid growth of hydropower in Sichuan, power structure becomes a primary issue of development of power grid. In this paper, the understandings of the connotation of coordinated development are proposed that it is of importance to rely on power exchanging using power grid platform to supplement provincial power and load characteristic. Main research contents are summed up from nine areas from the aspects of inside and outside province. And some difficulties needed to pay attention are also explained.