Abstract: Due to the long-term extensive planning, construction and operation management mode, the energy consumption of industrial parks is generally high, and the carbon dioxide emissions have exceeded 30% of the total national emissions, so carbon reduction in industrial parks is imminent. Firstly, the park-level integrated energy system model of CCHP considering wind turbine, photovoltaic, energy storage, carbon capture, cogeneration and other links is established. The life cycle method is used to assist in measuring the direct carbon emissions in the park. Based on the carbon emission flow theory, the accurate measurement of indirect carbon emissions generated by power purchase in the park is realized through the node carbon potential. Finally, based on the optimization of the park's power purchase scheme and the dynamic measurement of indirect carbon emissions by node carbon potential, the low carbon operation model of the park's comprehensive energy system is constructed with the daily operation cost and the total carbon emissions of the park as the optimization objectives. The numerical example shows that, compared with the optimization of daily operation cost, the cost of the model with the optimization goal of reducing carbon emissions is increased by 15.95%, while the carbon emissions of the park are decreased by 19.07%, and the carbon trading cost is decreased by 53.43%. It is proved that the operation strategy of introducing indirect carbon emissions of node carbon potential metering park and optimizing power purchase scheme based on the emissions can achieve the goal of reducing carbon emissions and better respond to the realization of the "double-carbon" goal.