In order to obtain the radiation spectrum of different light source color temperatures, a method based on the combination of colored glass and coating for color temperature conversion was proposed. The halogen lamp with 3 000 K color temperature was used as the standard light source and transformed it into 4 800 K standard blackbody radiation color temperature. According to the target color temperature transmittance spectrum curve, QB11 was selected as the substrate. In order to further modified the radiation spectrum, the optical film is coated on QB11 substrate. A 5-layer film system composed of TiO2 and SiO2 was designed by using Essential Macleod film design software. After optimization, the film thickness was 353 nm. The experimental results show that, the 3 000 K color temperature of standard halogen lamp can be effectively transformed into 4 800 K color temperature of standard blackbody radiation by the combination of color glass and optical film. The spectral deviation quality index was 3.67%. From the final spectral deviation quality index, the color temperature transformation method is effective through above method.