The test studied the influence of the CsNO₃ on the radiant intensity of the near-infrared illuminant（0.7～1.1 μm）composed of KNO₃-Mg-Si-C₄₈H₄₂O₇. Without changing the component of the KNO₃-Mg-Si-C₄₈H₄₂O₇,I_{0.7～1.1 μm} was improved by 20% with 5% CsNO₃. But added 10% CsNO₃,I_{0.7～1.1 μm} was not improved because of the fall of the main peak value of the spectrum energy. In order to adjust the component of the KNO₃-Mg-Si-C₄₈H₄₂O₇,it is better to add 6% CsNO₃ than 4% CsNO₃. The test approves when the CsNO₃ is used with the near-infrared illuminant composed of KNO₃-Mg-Si-C₄₈H₄₂O₇,it is appropriate to add 5%～6％ CsNO₃.