The Aldoped manganese dioxide nanowire has been prepared with the hydrothermal method by using KMnO4 and MnSO4 as raw materials. The structure and morphology of samples are characterized through scanning electron microscope (SEM) and Xray diffraction (XRD) respectively. Besides, the electrochemical performance of the sample is studied with the cyclic voltammetry (CV) and constant current charge and discharge methods. The results show that the nanosphere wires with a diameter of about 10 nm and a length of 80 nm are prepared when appropriate amount of Al(NO3)3 is added. When 1mmol of Al(NO3)3 is added, the capacitance is 1 127 mF/cm2 under 2 mA/cm2 of current density, which is 65% higher than that of pure manganese dioxide under the same conditions, showing good electrochemical performance.