The trend of power consumption of Incheon International Airport is quite different from general facilities but the first phase of power load design could not reflect it and just consider general load density(Lighting, Receptacle, Power). Because of this, installed Power facilities (including Transformer, Power cable, Circuit Breaker etc) are quite different from the real situation. This study shows reasonable design factor in commercial facilities in incheon airport by investigating the electric equipment capacity, peak power consumption, demand factor for the whole commercial facilities in Passenger Terminal, Concourse A and Traffic Center. This work could be used for airport power design compared with initial design.