Abstract: Taking manganese acetate and oxalate as raw materials to prepare manganese oxalate precursor, and the precursor was roasted at argon atmosphere to obtain manganous oxide with supercapacitive characteristics. The TG-DSC curves and XRD patterns of manganese oxalate precursor, and the SEM morphology, EDS results and electrochemical performance were analyzed. The results show that manganous oxide with face-centered cubic structure was obtained by roasting manganese oxalate precursor at argon atmosphere. The small granular manganous oxide with diameter 0.5-2.0 μm was got after roasting at 500 ℃, its capacitive characteristics distributed in the range of 0-0.8 V. The specific capacity was about 49.7 F·g-1 under the condition of 1 mol·L-1 Li2SO4 solution and 0.1 A·g-1current density, and the lost rate of specific capacitance was only 1.1% after 200 charge-discharge cycles, so it could be used as anode material of supercapacitor.