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This paper explains the main evaluation index of reliability. The formula deduction of mean time before failure is verified by Markov process in single unit. Series chain model of reliability is introduced. The main point is to show analysis method of reliability in repairable system and application in series ventilators based on Markov process which can reduce comprehensive energy consumption. Engineering adhibition of operation in series ventilators is analyzed to provide references for maintenance and diagnosis in underground ventilation.