Abstract: The carbon aerogel was prepared by the polycondensation of resorcinol (R) with formaldehyde (F) and sodium carbonate was added as a catalyst (C). Hydrothermal method was used to prepare MnO₂/CRF composite using KBrO₃ and MnSO₄•H₂O as raw materials. The structure of composite was characterized by N₂ adsorption and XRD. The result shows that MnO₂ prepared by hydrothermal method is pure pyrolusite, and the add of carbon aerogel powder doesn’t influence its crystal structure. Electrochemical characterization was performed using cyclic voltammetry and chronopotentiometry in 1 mol/L KOH aqueous solution electrolyte. The electrode has a stable electrochemistry performance, and preferable reversibility, the specific capacitanceof MnO₂/CRF electrode was 146.6 F/g under 1 mA current densities.The electrode presented a stable capacitance after 500 cycles and it’s an ideal electrochemical materials.