Abstract: CO₂ capture from coal-fired power plants (CFPP) is crucial for China to achieve carbon peaking and carbon neutrality goals. A novel system by integrating Ca-based CO₂ capture unit into coal-fired power plant is proposed. The integrated system retrofits the configurations of boiler and thermodynamic system, and improves the heat integration. Two integrated systems are respectively proposed based on steam Rankine cycle (SRC) and SCO₂-steam combined cycle (CSCC) for power generation and CO₂ capture. The thermodynamic performances of the integrated systems are evaluated by exergy efficiency and thermal efficiency, while the economic performances are assessed via levelized cost of electricity (LCOE) and CO₂ captured cost. The results show that the exergy efficiency of CSCC integrated system is 39.05%, and the efficiency penalty is 3.91% due to the CO₂ capture. The CSCC integrated system outperforms the SRC system due to the decrease in exergy loss of heat recovery. The LCOE of CSCC integrated system is 654.9￥/(MW·h), and CO₂ captured cost is 135.1￥/t CO₂. The integrated system can realize the collaborative conversion and efficient utilization of fuel chemical energy as well as waste heat, and reduce the cost of CO₂ capture.