In this experiment, the surface modification of bamboo charcoal was carried out by using tetraethyl silicate (TEOS) aqueous solution at different concentrations. The materials modified or not were characterized by SEM, FTIR and N2 adsorption-desorption. The electrode materials were determined by cyclic voltmeter and AC impedance test and constant current charge discharge test. As shown in electrochemical tests, the electrode materials which is prepared by the modified bamboo charcoal reveals obvious pseudo capacitance property. The specific capacitance can reach 76.5 F/g at 1 A/g in 1 M Na2SO4 aqueous solution, 80% higher than that of unmodified bamboo charcoal with a specific capacitance of 42.5 F/g