In order to improve lighting quality and achieve accurate and adjustable dynamic correlated color temperature of white light, a method of tricolor light mixing is used. Based on the colorimetric light color design, one mathematical model of RGB tricolor mixing is established. Appropriate parameters of tricolor LEDs are chosen to conduct the experiment of mixing white light with different correlated color temperature between 3000 K and 7500 K. The experimental color temperature of white light has a large deviation from the theoretical one. Further analysis tells us that the junction temperature is the main factor influencing the color temperature deviation. By adjusting the duty ratio to correct the output of the tricolor luminous flux, the relationship between the duty ratio and the target correlated color temperature is obtained. The experimental results show that the corrected color temperature deviation is within 50 K. The parameters for mixing white light sources match well with the theoretical ones and the white light source with different correlated color temperature is achieved. Temperature compensation can be realized by adjusting the tricolor luminous flux.