<正> I.INTRODUCTIONThe bullding automation system(BAS)had gained a great amount of attention in re-cent years.Many research results have beendeveloped.While the earlier systems use cen-tralized control with pneumatic actuators,thenewer version of BAS has moved toward dis-tributed control with direct digital equipments.More recently,the building automation sys-tem has started to work with the network and