Abstract: The Co₃O₄ materials have been synthesized via hydrothermal method,using sucrose as cobaltous nitrate Co（NO₃）₃,hexamethylenetetramine（C₆H₁₂N₄） and ammonium acid carbonate（NH₄HCO₃）.The physical properties of Co₃O₄ powders were characterized by X-ray diffraction（XRD）,scanning electronic microscopy（SEM）.The electrochemical properties of Co₃O₄ powders were characterized by cyclic voltammogram and galvanostatic charge/discharge measurements in 6mol·L-1 KOH electrolyte with the potential range from 0.0 to 0.4V（vs.SCE）.The results demonstrated that the Co₃O₄ by ₆H₁₂N₄ for the precipitation agent had a good stability performance.Its specific capacitance as single electrode was up to 239 F·g-1,that is 1.57 times of the Co₃O₄ specific capacitance by NH₄HCO₃ for the precipitation agent.It is indicated that the Co₃O₄ were prepared by ₆H₁₂N₄ as precipitating agent has good electrochemical capacitance performance.