Abstract: The traditional heat and power combined heating unit uses the medium pressure steam to heat the hot water,and there is a partial loss at the cold end.The high backpressure heating scheme and the heat pump scheme can supply the heating from extracting low pressure cylinder exhaust and reduce the heat supply.Taking a 350 MW power plant as an example,through theoretical calculation and energy-saving analysis,pumping heat,high back pressure heating supply and heat pump heating supply were investigated from the viewpoint of heating capacity,power generation load,coal consumption and thermoelectric ratio.The coal consumption of power generation of three heating modes are the lowest when running in power setting in heat,namely in the minimum exhaust volume operation. The coal consumption of power generation by pumping heating and heat pump heating mode increases significantly when running inthermoelectric decoupling mode.Heat pump heating mode is superior to high back pressure heating mode in heating guarantee rate.The high back pressure heating scheme is suitable for high heating load and power setting in heat.Heat pump heating scheme has a high heat supply load,and it can realize thermoelectric decoupling.