Abstract: In this paper, manganese dioxide/bacterial cellulose aerogel compositeswere prepared via one-step hydrothermal method using bacterial cellulose aerogel as matrix, aiming to obtain 3 D porous electrode with high specific capacitance and good stability. Morphology and crystal form of MnO₂/BC aerogel compositewere characterized by SEM and WAXD., Petal-shaped manganese dioxide is uniformly covered on the surface of the bacterial cellulose at a mass ratio of anganese dioxide to bacterial cellulose as 1.8:1.WAXD results indicate that δ-crystal of MnO₂ is successfully grown on the surface of the bacterial cellulose. The electrochemical testing results show that the specific capacitance of the composite material decreases with the increase of the scanning speed at the rate of 1 to 50 mV s^-1 in the 1 M KOH solution. MnO₂/BC aerogel composite exhibit an excellent specific capacitance is up to 210 F g^-1 at current density of 0.25 A g^-1 and the mass ratio is 1.8:1.. After 1000 cyclic volt-ampere tests at scan rate of 1 mV s^-1,the specific capacitance retention rate is 86.8%, showing outstanding cycling properties of MnO₂/BC aerogel composite.