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Sensitivity researches of three gross performance parameters of civil-aviation high bypass-ratio turbofan engine on five flow path components during cruising phase have been conducted based on Gasturb simulation software. It was found that during cruising phase,the efficiency of high-pressure compressor,high-pressure turbine have larger effect on Exhaust Gas Temperature(EGT),while the efficiency of fan、booster and low-pressure turbine have smaller effect on EGT. The reduction of the efficiency of five flow path components will lead to the rise of the EGT and fuel flow,as to the high pressure rotor speed,it has positive and negative effects.The reduction of the efficiency of the three parts on the low pressure shaft will increase the high pressure rotor speed,while the reduction of the efficiency of the two parts on the high pressure shaft can lead to the decrease of the high pressure rotor speed. It is related with the fact that fan rotating speed(N1) is chosen as control parameter.