Under the background of“double carbon”, in order to optimize the structure of energy, improve the consumption of renewable energy and promote the carbon emission reduction of the integrated energy system（IES）, a low- carbon economic dispatch mode based on carbon capture and electro- hydrogen- gas two-way conversion is proposed. Firstly, the two-stage process of power to gas coupled with hydrogen storage, hydrogen fuel cell and carbon capture is analyzed. The energy flow model of the IES with clean energy as the main energy supply and the electricity, heat, cold and gas load as the end is constructed. Then, the carbon cost of each equipment is analyzed for its participation in the carbon trading market. Finally, a mathematical model of low-carbon economic operation with the minimum operation and maintenance cost, energy purchase costs, environmental costs and hydrogen sales benefits is constructed. Considering the equipment constraints and the energy balance constraints of the system, the different typical operating modes are analyzed and compared, and the consumption character istics, environmental protection and economy of the proposed scheduling model are verified.