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The paper discussed a Verification and Validation (V&V) type of simulator for Nuclear Power Plant (NPP) which is adopted by Digital Control System (DCS), but DCS simulation is an important part of the V&V type of simulator. The paper proposed a structural scheme and simulation methods about the DCS simulation, and then analyzed control principle and control strategy simulation about DCS Simulation. In order to confirm the validity of this scheme, the simulation experiment about DCS is carried out with a full-scope simulation model of nuclear power plants. The experimental results show that the proposal of DCS simulation is correct and proves practical. The content of the paper can provide some technology service of verification and design in DCS, and also can provide some reference for the simulation technology about other process industry control system.