Abstract: The porous styrene-divinylbenzene (SDB) particles with different cross-linked structures and large particle size of Φ2-5 mm were synthesized by suspension polymerization method using styrene (St) as monomer and divinylbenzene (DVB) as cross-linking agent. A Pt-SDB hydrophobic catalyst was then prepared by impregnation-reduction. The influences of the dosages of DVB on the molecular structure, thermo stability, porous structure, compressive strength, hydrophobic property, the dispersion of Pt and the catalytic activity of SDB were investigated by FT-IR, TG, N₂ adsorption-desorption, electronic universal testing machine, CA, FSEM and hydrogen-water exchange test. The results show that the thermo-stabilities, compressive strengths and hydrophobic properties are improved obviously, the dispersion of Pt increases significantly, the specific surface area and pore volume increase by degrees and the average pore diameter reduces gradually with the increase of the amount of the cross-linking agent. When the molar ratio of DVB to St is 1∶1, the carrier of SDB hydrophobic catalyst has good performance. The SDB hydrophobic catalyst has excellent column efficiencies up to 95.6% at 65 ℃ and 96.1% at 80 ℃.