tTo enhance the specific capacity and cycling stability of manganese binoxide (MnO2) for supercapac-itor, antimony (Sb) doped tin dioxide (SnO2) is coated on MnO2through a sol-gel method to prepareMnO2electrodes, enhancing the electrochemical performance of MnO2electrode in sodium sulfateelectrolytes. The structure and composition of SS-MnO2electrode are characterized by using scan-ning electron microscope (SEM), transmission electron microscope (TEM), Fourier transform infraredspectroscopy (FT-IR) and X-Ray diffraction spectroscopy (XRD). The electrochemical performances areevaluated and researched by galvanostatic charge-discharge test, cyclic voltammogram (CV) and electro-chemical impedance spectroscopy (EIS). The results show that SS-MnO2electrodes hold porous structure,displaying superior cycling stability at large current work condition in charge-discharge tests and goodcapacity performance at high scanning rate in CV tests. The results of EIS show that SS-MnO2elec-trodes have small internal resistance. Therefore, the electrochemical performances of MnO2electrodesare enhanced effectively by Sb-doped SnO2coating.