Manganese dioxide is regarded as one of the most promising candidate as supercapcaitors electrode materials due to its many advantages.Nevertheless,current obstaclesto its practical application in SCs are mainly attributed to low conductivity,poor cyclic stability and limited utilization of active materials [1-3].To overcome the defects,there is an urgent need to design and fabricate an active electrode materials with high performance.Herein,we develop a facile approach to the fabrication of hierarchical MnO2/carbon composite in which spherical MnO2 particles were coated with mesoporous carbon nanoflakes,as shown in Fig.1.The structure and morphology can be easily controlled by the ratio of carbon precursor to MnO2.The resulted composite exhibits a high specific surface area(554 m2/g).The electrochemicalproperties of the MnO2/Cnanocomposites were investigated by cyclic voltammetry and galvanostatic charge-dischargetechniques.The hierarchical nanocomposite exhibits the highest specific capacitance of 228 F/g at a scanning rate of 10 mV/s.The relationship between structure and electrochemical performance of MnO2/C compositewas investigated in detail.