There are fourteen idle reasons (unobservable state) anda normal state in dataset (Table 1), and two states (observation state) in dataset (Table 2). The date set includes shorttime idle reason records and longtime idle reason records.The research decide to cut the time exceeded 6 hours if therecord is not routine maintenance, and the time exceeded2 hours except annual/monthly maintenance. According todifferent time duration we cut includes one minute a unit