The wall, roof and floor of the vault should use commercial concrete above c50, and it is not advisable to use concrete mixed on site. Wall thickness ≥250 mm, equipped with threaded steel bars with a diameter greater than 14 mm, double-layer bidirectional steel bars are arranged in a net shape, and the spacing between steel bars is ≤150 mm×150 mm. The wall standard should be close to the protection index of the main safety layer of the warehouse gate, and it has anti-theft performance such as explosion and drilling prevention. The ventilation device of the warehouse turns in the wall, so it is not easy to penetrate directly. The distance from the exit of the wall to the high ground should not be less than 2500mm, and the diameter should be less than or equal to 200mm. The tuyere should be protected by steel wire mesh. The underground garage building should be a double-wall corridor with a clear width of 600-800 mm, which is connected on all sides and has a refraction device at the corner.