Abstract: At present, efficient and clean coal power generation is receiving more and more attention. A kind of steam was proposed based on the current 1000 MW conventional supercritical reheating unit. Parameters for35 MPa/600/610/610 1000 MW high double reheat supercritical unit of thermal system solution. By comparing calculation of1000 MW high ultra-Supercritical double-reheat system compared to the conventional ultra-supercritical double-reheat unit, the thermal efficiency increases by about 0.92%. The exhaust steam of the unit was high in heat extraction and the loss was large in the heat transfer process.Two schemes were proposed : the external steam cooler system and the regenerative steam turbine system were used to compare the two schemes. The results show that the power generation efficiency of the external steam cooler system and the regenerative steam turbine system is 0.34% and 1.87% higher than that of the supercritical double reheating unit. The maximum power generation efficiency of the regenerative steam turbine system can reach 48.84% and the energy saving effect is remarkable.