Abstract: From the current actual situation, the domestic social economy has been further developed, and the needs of the domestic people have also been significantly improved. Observing the daily operation of the substation, we can see that the operation of the power system requires the substation to play a very important role. Therefore, when there are obvious problems in the DC system grounding of the substation, it will inevitably bring extremely serious harm. Therefore, targeted treatment measures need to be taken to avoid serious economic losses. Among them, the harm of DC system grounding is the most common fault, and measures need to be taken to deal with it.