For the problem about qualified acceptance conversion exhaust gas temperature value of a type of turbofan-engine in the factory but occasionally unqualified exhaust gas temperature measurement value in the offsite ground test

the defect of exhaust gas temperature conversion method only considering single factor of air temperature was analyzed. A kind of exhaust gas temperature conversion method comprehensively considering use factors including the nonstandard atmosphere and the adjust law was put forward

the mathematics model was established

and the correcting coefficient of nonstandard atmosphere and the correcting coefficient of adjust law were obtained by calculation

which were verified by test on the bench. As a result

exhaust gas temperature conversion method considering use factors met the actual conditions of the engine

the relative error between the correcting coefficient obtained and the trial test data was less than 1.3%

effectively solving the problem about qualified conversion exhaust gas temperature value in the factory but unqualified exhaust gas temperature measurement value in the offsite ground test.