In order to improve the low-carbon operation capacity of the integrated energy system with thermal power as the core under the “carbon peaking and carbon neutrality goals” background, this paper comprehensively considers the carbon capture cost and carbon transaction cost of thermal power units, and studies the operation and configuration of the electric-thermal multi-energy complementary integrated energy system. The coupling model of integrated energy system considering carbon capture and installation is established. The equipment model is established based on the coupling relationship of carbon, gas and heat. The power network and thermal network models are established based on the linearized flow model and mass regulation, the economic dispatching model of integrated energy system is established, considering unit cost, carbon transaction cost and new energy disposal cost, combined with network operation constraints, the modified IEEE 33-node distribution network and 6-node thermal network are used to analyze the regional electric heating integrated energy system. The influence of heat network modeling, carbon trading price and carbon capture cost on the operation and configuration of integrated energy system is discussed in the calculation example, and the marginal carbon price and carbon capture installation cost that can improve the system income are calculated, which provides a reference scheme for the construction and operation of integrated energy system under the “dual-carbon” background.