An academic model and a kind of experimental method are built in this paper to efficiently revise influence on results from surroundings and medium in thermometry.This revised method, taking into consideration of the attenuation coefficient of the irradiator from its surrounding, can dramatically improve the precision and universality of thermometry technology based on gray-body. First, accurate fingerprint spectrum of the irradiator in given airborne is obtained via using the multichannel CCD image spectrometer, which is made equivalent to a gray-body model at the same time make it. Then, this irradiator is put into an uncharted environment and medium to measure its radiation spectrum repeatedly.Besides, a gray-body model which contains attenuation properties from determinand is buit. Finally,this paper precisely conclude the temperature of the irradiator in exact environment and medium by comparing the graybodies in two above situations. The paper tests the universality and veracity of this thermometry technology and revised method via a series experiments about the same kind radiators in different environment and medium.