Abstract: Manganese Dioxide was prepared by chemical reduction method with various anion reducing agent.The acidity-alkalinity of reagents had effect on the coulor of the samples from the experiments.TEM results indicated that MnO₂ prepared were all of rod-like structures.The sample 1 reduced by NaHSO₃ distributed equalitier,electrochemical measurement revealed that the sample 1 had the highest capacity,it showed good Capacitance Property in the voltage window（0~1.0V） measured by CV.The specific capacitance of MnO₂ is 237.39 F·g^-1 at 5 mA·cm^-2 at first cycle and 242.57 F·g^-1 after 700 cycle,the loss of the capacitance was only 5.12%.