Coupled carbon capture systems are an important way to decarbonize combined heat and power-carbon capture and storage(CHP-CCS).Research on the energy consumption distribution of CHP-CCS units and their flexible operation strategies has attracted more and more attention.This paper uses the EBSILON simulation platform to establish a thermodynamic analysis model of the CHP-CCS unit,and obtains the unit decarbonization energy consumption distribution,thermoelectric load characteristics and operating feasible region.It proposes an improvement plan for the CHP-CCS unit to reuse waste heat and pressure to reduce the operating energy consumption of the coupled system.The paper studies the impact of changes in carbon capture amount of the CHP-CCS unit on the unit energy consumption and thermoelectric output under different operating conditions during the heating period and the non-heating period,and proposes a flexible and efficient operation strategy for the CHP-CCS unit;it also introduce a carbon trading mechanism,build a CHP-CCS unit net income model that comprehensively considers carbon emissions,carbon trading and peak shaving policies,and analyze the impact of carbon trading prices on unit net income.The results show that the electric heating output of the CHP-CCS unit has increased after the renovation,and the total revenue of the unit is closely related to the heating period,operating conditions,decarbonization rate and carbon transaction price.