Abstract: High-whiteness aluminum hydroxide fillers obtained from different precipitation techniques are all possessed of their own morphology of crystal growth. The microstructures of the fillers obtained from both carbonization precipitation and seed precipitation were investigated by scanning electron microscope (SEM), X-ray diffraction and Raman spectra. The results showed that the aluminum hydroxide crystals of high-whiteness fillers belong to monoclinic system with the space group P21/n, and the preferred growth crystal faces in both precipitations are (002), while the value of preferred orientation factor of seed precipitation crystals is smaller than that of carbonization precipitation crystals, and the former is of polycrystal face growth. Comparing the seed precipitation crystals with carbonization precipitation ones, the former's lattice parameter and Raman full width at half-maximum(FWHM) are both lower than the latter's, as well as the crystalline inclusions and lattice defects. However, the former's crystallinity is remarkably superior to the latter's.