The sum of the net width of the entrance of the personnel shelter project in wartime in 3.3.8 of civil air defence basement Code shall be calculated and determined according to the number of people sheltering not less than 0.30m per 100. The number of people passing through each door should not exceed 700, and the net width of the entrance and exit passages and stairs should not be less than the net width of the door opening. The net width of the entrance and exit passages and stairs shared by two adjacent protection units shall be calculated and determined according to the total number of people passing through two shielded entrances 100, not less than 0.30m.