The first type of lightning protection standards are buildings that manufacture, use or store a large number of explosive substances, such as explosives, gunpowder, primary explosives and cultural relics. , will explode due to electric spark, causing great damage and casualties, buildings with explosive dangerous environment in area 0 or 10, buildings with explosive dangerous environment in area 1, buildings with explosive dangerous environment due to electric spark, causing great damage and casualties. The second-level lightning protection standards are particularly important buildings such as national key cultural relics protection buildings, national pavilions, office buildings, large-scale exhibition and exposition buildings, large railway stations, state guesthouses, national archives, and important water supply pump houses in big cities. The third-level lightning protection standards are provincial key cultural relics protection buildings and provincial archives protection buildings. The estimated lightning strike frequency is greater than or equal to 0.0 12 times /a and less than or equal to 0.06 times /a, the estimated lightning strike frequency of provincial office buildings and their important or crowded public buildings is greater than or equal to 0.06 times /a, and the estimated lightning strike frequency of residential buildings, office buildings and other general civil buildings is less than or equal to 0.3 times/a.