This project is the design of basement roof, civil air defense wall, door frame wall and partition wall between units. For the structure of other components such as walls, columns, stairs, exterior walls, baseplates, etc. in the foundation and single body, see the structural drawing of the superstructure design institute. It mainly includes design description, general drawing and description of beam structure, civil air defense wall plan of B1 in Zone B (A), (B), reinforcement of civil air defense structure wall body