Abstract: This research focuses on performance analysis and design optimization of CSP plants integrated with SCO2 systems. The thermodynamic models are established to analyze the performance of the collector subsystem and power cycle subsystem. The interaction characteristics among the heat collection, thermal energy storage, and energy conversion process are demonstrated. The performance comparison of different CSP systems are conducted in this study, of which three collectors, two heat storage mediums, and two SCO₂cycles are considered. Finally, the optimization are conducted for the proposed systems. The results show that compared with linear Fresnel and parabolic trough collectors, solar power towers（SPTs） generally exhibit a more consistent optical performance in summer and winter and the annual heat-collecting efficiency reaches 43% by SPTs. Increasing the hot tank temperature or decreasing the cold tank temperature contribute to higher annual power generation. The optimization result indicates that the SPT plant integrated with recompression SCO₂ cycle and NaCl-KCl-MgCl₂ molten salt provides the best thermodynamic performance.