Abstract: Ce modified γ-Al2O3 support samples were prepared by sol-gel method with and without the presence of a pulse electromagnetic field (PEMF), respectively. The physical properties and thermal stabilities of the samples at different pulse voltage were characterized by N2 physisorption, scanning electron microscope, IR spectroscopy and X-ray diffraction techniques. Results show that the specific pore volume and specific surface area of Ce modified γ-Al2O3 sample at 300 V increase by 19.50% and 18.45%, respectively, compared with sample without PEMF treatment. Moreover, the amount of hydroxyl group covered on the surface of γ-Al2O3 increases resulting from evenly dispersed CeO2 and the high temperature thermal stability of samples with PEMF treatment is improved accordingly.