Abstract: To ensure safe and fast startup and shutdown of supercritical carbon dioxide (S-CO₂) power generation system, the paper proposes a two-stage control strategy for the warm start-stop of a 600 MW S-CO₂ recompression cycle power generation system. The two stages employ the valve joint inventory to control load strategy and the turbine inlet temperature control strategy, respectively. Besides, the implementation schemes of cold start and stop of each equipment in the system are put forward. Based on the start- stop control strategy proposed, the start-stop process of 600 MW S-CO₂ recompression cycle power generation system is simulated. The safety indexes of the system during start and stop are tested and satisfied, including the compressor surge margin, the heater minimum flow rate, the tube wall temperature change rate, and the working fluid maximal and minimal pressures. The stop process takes 1.11 h, and the start process takes 1.09 h. Compared with the literature, the start time is shortened by 0.57 h and the stop time is shortened by 0.83 h, validating the effectiveness of the start-stop control strategy designed in this paper.