Abstract: Kaolin samples collected from Guiyang, Zunyi, Xiuwen and other localities of Guizhou Province were analyzed by means of X-ray diffraction, electron microprobe, electronp aramagnetic resonance and infrared spectrometry for their compositions and therm ophysical characteristics. The chemical compositions, mineral compositions and me chanism of coloration and whiteness of kaolin provide strong evidence suggesting that the kaolin samples contain iron and titanium. In addition, studies have al so been made on the influence of iron and titanium on the whiteness of kaolin. K aolin samples from different localities are different in texture, shape, whitene ss and color. The existing forms of iron and titanium in kaolin have a great eff ect on the whiteness of kaolin. Moreover, the thermophysical characteristics of kaolin have also documented, demonstrating that kaolin from Guizhou Province is characterized by low thermal expansion coefficient and high emittance. The produ cts of phase transition of kaolin are mullite and cristobalite.