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Due to the low accuracy rate and poor reliability of the traditional decentralized control system for DCS failure risk assessment, the control precision of the system is low. A maintenance platform for DCS power loss fault dispersion control system is designed. According to the analysis of hardware and electrical loss feeder structure system failure risks often occur in power system and communication structure in DCS distributed control system failure, loss of power failure occurred from two aspects of the establishment of risk evaluation index and the probability of fault power loss, and the index is based on the common faults for channel construction the mathematical model of electric loss fault risk assessment, the risk assessment model of fault control platform design, system maintenance. The experimental results show that the maintenance platform can effectively improve the control accuracy and reliability of the DCS power loss control system.