According to the resistance grade, it can be divided into 9 grades, such as 1, 2, 2B, 3, 4, 4B, 5, 6 and 6B, and the project can be directly called a certain level of civil air defense project;
According to wartime purposes, it can be divided into command and communication, personnel shelter, hospitals, ambulance stations, warehouses, garages and so on.
According to the usual use, it can be divided into shopping malls, playgrounds, hotels, theaters (halls) and so on.
According to the chemical protection grade, it can be divided into four grades: A, B, C and D.
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