It is very difficult to directly measure the effective emissivity of a blackbody cavity, which is generally calculated by theindirect methods. Different calculation methods have certain differences. In this paper, the STEEP software, TRACEPROsoftware and approximation formula are used to calculate the effective emissivity of the blackbody cavity for the threecommonly used blackbody models of integrating sphere, cylindrical and cylindrical-conical, and Compare the results ofemissivity greater than 0.99. The results show that the consistency of the results of the three methods in calculating thecylindrical type and the integrating sphere type blackbody can be better than 0.03%. When calculating the conical blackbody, the difference between the results of the approximate formula and the other two schemes is less than 0.07%. Thecalculation results of the scheme tend to be consistent with the increase of the emissivity of the model.
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