A thin layer of silica was deposited on a porous α-alumina support by electrophoresis. A voltage of 1 - 1.5 V was applied for 30 min at the temperature of 50ºC. Copper electrode was used as the anode. The coating sol consisted of colloid particles of 50 - 500 nm in a mixture between I solution and II solution, followed by aging for 3 days after addition of [CH3(CH2)13N(CH3)]3Br as a template. The I solution was formed by mixing TEOS with ethanol. The II solution was an aqueous solution of nitric acid. The membrane was dried for 24 hours, keeping the humidity constant to prevent from cracks and defects. To compare the properties, a thin layer of silica was coated by dip-coating in the same sol, as well. XRD and SEM were employed in the structural study of the membranes. And gas permeation of H2/N2 was measured.