The development of an integrated energy system is a key initiative to economic development, energy conservation and emission reduction. Firstly, to improve the peaking capacity of the units and reduce CO2 emissions, carbon capture technology is introduced into the integrated energy system, and its role in the flexibility, economic, and low-carbon operation of the integrated energy system is studied.Then, to reduce the pressure on the system caused by fluctuations in load and wind power peaks and valleys, the role of demand response of electric and thermal loads is considered to achieve healthy and sustainable operation of the integrated energy system. Finally, the role of energy coordination and coupling is considered, and a low-carbon economic dispatch model for the integrated electricity-thermal energy system is constructed to minimize the comprehensive cost. The results of the analysis show that the combined effect of carbon capture and demand response reduces the total operating cost and carbon emission cost of the system, promotes the consumption of wind power from both the source and load sides, and facilitates the flexible dispatch and low carbon operation of the integrated electricity-thermal energy system.