Abstract: The application of supercritical carbon dioxide (sCO₂) cycle has received extensive attention in different fields, but its cost-benefit-analysis system is still incomplete. When the accurate sCO₂ cycle component cost is obtained, the design goal of the sCO₂ cycle will be shifted from efficiency optimization to cost-benefit maximization. The cost formulas for the key components of the sCO₂ cycle were reviewed and classified. It can be found that the cost formula is usually a power function of the "scaling parameter", and the methods for obtaining the undetermined coefficient are different. Based on the independently constructed thermodynamic calculation model of sCO₂ cycle, the characteristics of the sCO₂ cycle components cost formulas were compared and analyzed. The results show that when the main vapor parameters are the same as the circulation layout, the calculation results of different cost formulas are quite different, and a higher cost is mainly caused by the unreasonable scale of the reference cost relationship. Turbine costs are generally too large, the compressor costs are obviously differentiated in two poles. The research on the heat exchanger cost model takes various factors into consideration. On the whole, the heat conductance can better reflect the cost characteristics of the heat exchanger. Against the research progress, several problems that need to be solved urgently in the cost calculation of sCO₂ cycle components are pointed out. The component cost formulas not specifically used for sCO₂ cycle is selected, which is lack of rationality verification analysis. Temperature and pressure correction factors should be included in the cost formula. The quantitative research on the cost formula uncertainty is still insufficient.