The different illuminating composition with different oxygen balance which have the same quantity of reaction heat were designed and tested by a moment transform lamp－house radiometer. The results show that when oxygen is deficient,the burning temperature of illuminating composition increases along with the oxygen balance tending to zero,and radiant intensities of the near－infrared (0.7-1.0 μm) and visible light (0.4-0.7 μm) are improved at one time,and the extent of near－infrared radiant intensity is much larger that of visible light. It′s inferred that the radiancy is preferable when oxygen balance close to zero.