Combined with the Anxin 220 kV substation project in Baoding, this paper studied on the influence of high submerged depths on substations. The design concept of flood control for substations was put forward which was permitting the flood go into the substation and building the higher electrical equipment foundation than water level. This design concept has realistic guiding significance to the flood control of the substations in the areas that is short of earthwork and has high submerged depths.