H_3PW_(12)O_(40)·xH_2O and H_4SiW_(12)O_(40)·xH_2O were synthetized. Three types of polyoxometalates(POMs)-containing titania, zirconia, SG(silica gel) composites such as H_3PW_(12)O_(40)/TiO_2, H_3PW_(12)O_(40)/ZrO_2 and H_4SiW_(12)O_(40)/SG were also prepared by the method of sol-gel and impregnation. The structure of the POMs composites was confirmed by Fourier Transform Infrared Spectroscopy(FTIR) and X-ray diffraction(XRD). The results showed that H_3PW_(12)O_(40)·xH_2O and H_4SiW_(12)O_(40)·xH_2O poss...