Abstract: In order to improve the flexibility of unit peak shaving and reduce carbon emissions, we built a optimal distribution model of revenue and load of cogeneration unit, and obtained the distribution strategy, revenue and carbon emission characteristics of cogeneration unit. We selected four operation scenarios of two 350 MW units, used the evolutionary algorithm EA to optimize the thermoelectric load distribution with the goal of maximum overall income and minimum carbon emission of the units, and obtained the income and reasons of the four operation scenarios; We also defined the uneven distribution of thermoelectric load of two units, and investigated the influences of uneven distribution of thermoelectric load on the total income of units under four scenarios. It provides a reference for efficient and low-carbon load optimal distribution and flexible operation of cogeneration units.