Through the comprehensive analysis of the evacuation staircase,safe exit and passage width of commercial buildings,it introduces the basis of calculating evacuation width and its steps,summarizes some simple calculation methods combined with design experience and calculation examples,so as to make the safe evacuation width design of commercial buildings more reasonable.

Aimed at large open office place,the articl puts forward some claims for building grades of fire resistance,evacuation exit and evacuation walk,fire door,interior decoration,smoke extraction system and emergency lighting.

Based national defending fire standards,combining with practical engineering design experience,it discusses easily produced defending fire and discharging smoke problems of civil building project design,typically analyzes inside aisle and defending fire valve setting point of ventilating air-conditioning system,and puts forward correlated suggestions to make standard have real-time furthermore.