The thermal radiation similarity of buoyant turbulent jets is studied. The principal condition for the radiation similarity is the similarity of the temperature and the concentration fields in the near-nozzle region because the main part of radiation is generated by this most heated section of the jet. The k-epsilon-T＇(2) turbulent viscosity model is used to study numerically the gas dynamic similarity in the near-nozzle zone. It is shown that the excess temperature and concentration fields of different jets can be described by a universal function of the dimensionless coordinates that are longitudinal and transverse coordinates normalized with respect to the special longitudinal and transverse scales. It is found, as a result of the gas dynamic similarity, that the dimensionless spectral intensity (normalized with respect to the production of spectral radiance at the edge of the nozzle and the nozzle area) is described by a universal function which is the same for a wide class of jets and which depends on the exit parameters, radiation frequency and on the steepness of the temperature dependence of the absorption coefficient. The results obtained are generalized for the case of molecular gas radiation in finite spectral intervals containing many spectral,lines. A simple and effective method for jet radiation prediction, which does not require a detailed information about the jet gas dynamic structure, is developed.