The matching relationship btween turbine and boiler steam parameters of supercritical and ultrasupercritical units is concerned in energy loss of steam and capital investment

the optimal selection of it can be determined only through technical and economical comparision. There is an optimal distribution value between constant enthalpy temperaturedrop resulting from pressure drop in the steam pipeline and rediating heat loss in the said pipeline. Statistics and analysis of steam parameters’ matching between boiler and turbine for supercritioal units in operation at home

as well as for supercritical and ultra-supercritical units at abroad

have been carried out in this paper. Based on calculation and analysis of pressure drop value for main steam parameters from superheater outlet of different boilers to steam turbines’ inlet

and temperarature drop value of main steam from boiler to steam turbine

a scheme for selecting steam parameters’ matching in main steam system between steam turbine and boiler

as well as steam parameters’ matching in reheated system under different steam parameters of ultra-supercritical units in our country has been recommented.