Abstract: Carbon aerogel was synthesized via a sol-gel process from the polycondensation of cresol and resorcinol with formaldehyde catalyzed by NaOH, followed by drying at ambient pressure and pyrolysis at 900℃ under inert atmosphere. Results show that this carbon aerogel has a BET surface area higher than 500m2/g and a fairly uniform pore size distribution in the range of 8-20nm. The electrochemical behavior of such a carbon aerogel used as electrode material for an electrical double-layer capacitor was investigated by impedance spectroscopy. It is found that this carbon aerogel exhibits nearly ideal double-layer capacitance characteristics. The volume specific capacitance and the mass specific capacitance in 1mol/L sulfur acid solution can reach as high as 70F/cm3 and 97F/g.