Abstract: MnO₂ nanorods for supercapacitors were prepared by hydrothermal synthesis method. The samples were analyzed by scanning electron microscopy （SEM）, N₂ adsorption and X-ray diffraction （XRD）. Cyclic voltammetry and galvanostatic charge-discharge were used to characterize the electrochemical performance of the samples. The results showed that the prepared samples were α-MnO₂ with a BET specific surface area of 105.2m²/g. The particles were in a rod shape with a diameter of 50 to 70nm. In an electrolyte of 1mol/L （NH₄）₂SO₄, electrode based on the MnO₂ showed perfect pseudocapacitive and power characterization in the potential region of -0.5～0.4V（vs. SCE）. At a current density of 10mA/cm², a specific capacitance of 413F/g was achieved.