Abstract: The heating in northern China mainly relies on coal-fired boilers.The emissions of carbon dioxide during a heating season reach 1 billion tons.The extract steam heating from nuclear power plants instead of traditional coal-fired heating is of great significance for reducing CO2 emissions and achieving carbon peak targets.Through the simulation software,the AP1000 unit steam turbine power generation system loop extraction heating is used to heat a plant area of 104 000 square meters.The heating is accomplished by extracting steam at three major locations:main steam pipes,auxiliary steam pipes and the turbine.The optimal extraction positions are located after a comparison of the electricity output changes under three heating strategies.The simulation results show that the extraction heating through the main steam pipes,the auxiliary steam pipes and the turbine causes the electricity output to decrease by 0.36%,0.19% and 1.17% respectively after heating.A comprehensive comparison of the data suggests the auxiliary steam extraction heating in the plant area has the lowest impact on the power generation of nuclear power plants.