Abstract: To address the limitations in peak-shaving and peak-load regulation capabilities caused by the strong thermoelectric coupling of a 660 MW supercritical coal-fired heating unit, and to compensate for the deficiency in existing research on the economic benefits of molten salt thermal energy storage (TES) coupled with coal-fired units, this paper establishes and verifies the thermodynamic system model of the unit using EBSILON software. An electric heating TES system adopting Hitec molten salt as the heat storage medium is designed, the corresponding heat release scheme is determined, and an optimal scheduling model for the combined thermal power and energy storage system based on the mechanism of "medium-and long-term contract for difference plus spot deviation settlement" is constructed. The results show that under the rated feedwater flow rate of 80 t/h, the relative peak-shaving depths of the system during heat charging and discharging reach 25.99% and 4.20%, respectively. When the heat supply is 150 t/h, the peak-shaving capacity of the unit increases by 72.84 MW, and the round-trip thermal efficiency of the whole heat charging and discharging process is 53.88%. Under high, medium and low electricity price fluctuation scenarios, the average daily net profit of the unit increases by 4.68%, 3.76% and 5.53% respectively, with the maximum annual revenue reaching 21.5543 million yuan. This system can simultaneously improve the flexibility and economy of the unit, providing technical solutions and quantitative support for peak-shaving transformation of similar units and revenue growth in the electricity spot market.