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Reliability is very important in the quality of the digital electro-hydraulic control system (DEH) for nuclear power steam turbines. From the perspective of improving system reliability, the working principle of nuclear power DEH was analyzed. And a nuclear power DEH system based on heterogeneous processors was designed, and the system architecture, hardware composition and dual redundancy design scheme of DEH were given. Based on Markov process theory, the reliability function model of dual redundancy nuclear power DEH was established, and the failure classification of nuclear power DEH was combined with the reliability block diagram and dual redundancy system state transition diagram. The state transfer equation was established by introducing the parameters such as failure rate, maintenance rate, common cause failure factor and diagnosis coverage rate, and the reliability of the system based on Markov model in different life cycles was analyzed. The reliability of double redundancy nuclear DEH is tested by an example, which provides guidance and reference for engineering designers.