Rare books area keeps the valuable heritages and historical books. All supervisors are very careful and cautious to well protect them. After searching many kinds of firefighting systems, they choose the water mist system to protect this important area. This is because the excellent firefighting function of the water mist. In order to prevent the malfunction, the activation system will confirm whether it fires or not so as to decide to actuate the system or not. Besides that we separated the area into many sections in order to control the damage to less.