Abstract: Substation plays an important role in the power grid system.The substation building is equipped with a main control room, secondary protection room, distribution room, battery, video, fire control system, etc.The roof waterproofing quality is not up to standard, and rainwater seeps into the building, which can directly cause live products inside the building to not move, trip, or stop operating.Through the selection of waterproofing materials, optimization of waterproofing design, and improvement of construction technology, and proposes a series of effective prevention and control measures to improve roof waterproofing capacity and extend the service life of buildings for reference in relevant industries.