Introduction   Hydraulic coupler in thermal power plants of electric boiler feed water pump set of frequency conversion energy-saving renovation， analysis of whether to retain the hydraulic coupling regulating function.

  Method  Through theoretical analysis of energy consumption of hydraulic coupling itself， at the same time， feed water pump frequency conversion to the same type unit after transforming， comparing the running situation of the actual cases from the aspects of safety， energy saving and other hydraulic coupler in thermal power plants electric adjustment of boiler feed water pump group of inverter whether keep hydraulic coupling regulating function were discussed.

  Result  Electric hydraulic coupler to adjust the boiler feed water pump group of inverter is not retained hydraulic coupling plan than keep hydraulic coupling overall energy saving rate is high， the economic， security and enough guarantee.

  Conclusion  Electric hydraulic coupler to adjust the boiler feed water pump group of inverter， don't keep hydraulic coupling regulating function scheme is more suitable.