This study aims to realize the real-time control of the white light color temperature in a laser display system. For this purpose, first, we calculated the optical power ratio of an RGB laser (R: 638 nm; G: 520/532 nm; and B: 450 nm) when mixing white light of color temperature 5500--7500 K according to CIE1931 and CIE1964 standard colorimetric observers. Subsequently, we analyzed the effects of the light power proportion, center wavelength, and spectrum width on the color temperature, chromatic coordinates, and luminous flux of the mixed white light. Finally, we realized a real-time optical feedback and control system based on the AS73211 color sensor and achieved a color temperature control error of less than ±50 K in the 5500--7500 K range.