Abstract: Due to the flexible power sources account for a small proportion in the power system with a high proportion of wind power, coal-fired units need to be frequently and deeply peaked, which will reduce the low-carbon economic operation level of the system. Based on the above background, we analyzed the impact of boiler, steam turbine and other auxiliary systems as well as the desulfurization and denitrification process on carbon emissions under different load rates, and studied the carbon emission characteristics of each peak shaving stages, so as to establish a calculation model for the whole process carbon emission intensity considering deep peak shaving of coal-fired units. Aiming at the low utilization rate of pumped storage units, we proposed a low-carbon economic dispatch strategy based on low-carbon calling coefficient for deep peak shaving of pumped-storage auxiliary coal-fired units. Then, with the goal of minimizing the total operating cost the system, we established a low-carbon economic dispatch mode. Finally, the simulation based on the improved IEEE 39 node example verifies the feasibility of the proposed model, and the results show that the proposed strategy can effectively improve the utilization rate of pumped storage units, reduce the deep peak shaving energy consumption and carbon emissions of coal-fired units, and achieve the low carbon economic operation of the system.