Abstract: Low hydrated zinc borate Zn₆O（OH）（BO₃）₃ was prepared with industrial borax and zinc sulfate heptahydrate as raw materials by precipitation process.Structure and morphology of the product were characterized by means of X-ray powder diffraction（XRD），scanning electron microscopy（SEM），Fourier transform infrared spectroscopy（FT-IR），and thermo gravimetric analysis（TGA） etc.The influences of reaction pH，reaction temperature，reaction time，and mix ratio of reactants on the structure and composition of product were investigated.The conditions of synthesizing Zn₆O（OH）（BO₃）₃ were obtained as follows: amount-of-substance ratio of industrial borax to zinc sulfate heptahydrate was 1∶1，reaction pH was at 7.5~8.0，reaction temperature was 90 ℃，and reaction time was 6 h.The yield of the product was 83% under those condtions.

Key words: zinc borate, precipitation process, process condition