The transition from electricity suppliers to integrated energy suppliers is coming out in the background of the energy Internet. It was proposed that a sort of low-carbon operation mode for hierarchical integrated energy service provider which was composed of 2 stages. The first-class service provider dealt with low-carbon unit and grid scheduling and produced low-carbon and comprehensive energy consumption indexand delivered them to the sec-ond-class service provider. Based on the low carbon index of intergrated energy system, the hybrid energy supply mode at the end-user node was optimized. The analysis of low-carbon operation strategy was carried through by the rate of carbon reduction and integrated energy utilization of terminal users. Through the optimized simulation, it could be concluded that the addition of electric heat storage boilermakes for carbon emission reduction, while the gas boiler makes for improving the integrated energy utilization rate.