By taking the ultra-supercritical 1000 MW single reheat unit at Guangdong Jiahuwan bay as an example

the actual engineering application of echelon cycle(EC) was studied. Under the same boundary conditions

thermal calculation of the conventional cycle and EC were carried out

and operation flexibility of the EC was analyzed. The results show that

using EC can reduce the equipment investment of power plants

improve the unit economy

and have no control difficulties in plant operation. The EC is applicable to power units with single-reheat/double-reheat with reheat temperature of 600 ℃ and above

and its successful application lays the foundation of engineering application for 700 ℃ ultra supercritical power generation technology.