1. Business halls should not be set in the underground three floors and three floors below.

2. Should not operate and store fire hazards for the properties of the A, B storage items.

3. When there is an automatic fire alarm system and automatic fire extinguishing system and building interior decoration in line with the current national standards, "building interior design fire code" GB50222 of the relevant provisions of the business hall of the maximum permissible floor area of each fire protection zone can be increased to 2000m2.

4. Smoke and smoke evacuation facilities should be set up. Facilities.

5. When the total floor area of the underground store is more than 20000m2. Should be used without opening doors and windows of the firewall separation. Neighboring areas do need to be partially connected, should choose to take the following measures for fire separation:

(1) sunken plaza and other outdoor open space. The outdoor open space should be able to prevent the spread of fire in adjacent areas and facilitate safe evacuation. (2) Fire compartment. The walls of the fire compartment shall be solid firewalls, and normally-opening Class A fire doors that can close by themselves in case of fire shall be installed in the adjacent areas of the compartment. (3) Evacuation aisle. The refuge aisle shall conform to the relevant provisions of the current national standard "People's Air Defense Engineering Design and Fire Protection Code" GB50098, and the walls on both sides of the refuge aisle shall be solid firewalls, and the walls of the partially connected areas shall be set up with normally-opening Class A fire doors that can be closed by themselves in case of fire. (4) Smoke-proof stairwell. The doors of the smoke-proof stairwell and the front room shall be normally open Class A fire doors that can close by themselves in case of fire.