As the supplement and expansion of the conventional exergy analysis method

the advanced exergy analysis method can reveal the internal reason of the exergy destruction of various parts of the gas-steam combined cycle system in more depth. The main components of gas-steam combined cycle are analyzed by the advanced exergy analysis method. Additionally

the exergy destruction is classified into endogenous exergy destruction

exogenous exergy destruction

avoidable exergy destruction and unavoidable exergy destruction. The results show that the endogenous exergy destruction rate is 76.06% and the unavoidable exergy destruction rate is 86.33% in the gas-steam combined cycle system under the design conditions. Besides

most of the endogenous exergy destruction and unavoidable exergy destruction occur in the combustion chamber

which are respectively 209.0 MW and221.8 MW. Moreover

the avoidable exergy destruction of combustion chambers and gas turbines are 16.8 MW and12.8 MW

respectively. This research conclusions can provide reference for the transformation of system energysaving and the design of the new system.