Abstract: To fully exploit the potential of energy saving and carbon emission reduction of integrated energy system (IES), a multi-user integrated energy service sharing method is proposed with stepped carbon emission cost taken into account, aiming to improve the energy supply economy of integrated energy service providers (IESPs) and the satisfaction of users’ energy consumption. Firstly, a distributed energy sharing framework of regional IESP is established based on the multi-agent system, and the mathematical model for internal operating equipment and load of the IES is developed. Secondly, an IES economic dispatching model considering both the stepped carbon emission cost and operation cost is built. Additionally, a demand response model of uses is developed with energy consumption satisfaction taken into account. A multi-IESP cooperative operation model is proposed based on Nash bargaining theory, which is then transformed into two sub-problems: social resource minimization and payment cost minimization. To solve these problems, the ADMM algorithm is employed to solve the model. Finally, by setting up multiple operation scenarios, case study verifies the effectiveness of the proposed method in economic operation, energy saving and carbon emission reduction of IES.