For　improving　the　conductivity　of　porous　carbon　and　the　utilizations　of　its　pore　structures,　a　hierarchical　porous　carbon　(HPC)　had　been　developed　with　highly　fluffy　three-dimensional　(3D)　continuous　network　structure.　Using　the　HPC　as　a　support,　a　novel　MnO2@HPC　composite　with　3D　interpenetrating　network　structure　was　prepared　as　electrode　material　of　supercapacitor　via　simple　hydrothermal　method.　When　the　hydrothermal　reaction　temperature　was　100　degrees　C,　the　MnO2　nanofibers　(similar　to　5　nm)　were　uniformly　grown　on　and　within　the　fluffy　3D　porous　network　of　the　HPC,　forming　a　composite　with　interpenetrating　network　structure.　The　as-prepared　composite　(MnO2@FIPC-100)　exhibited　the　characteristics　of　both　electric　double-layer　capacitance　and　pseudo-capacitance,　which　had　a　high　specific　capacity　of　368　F　g(-1)　at　a　current　density　of　0.5　A　g(-1)　and　186　F　g(-1)　at　10　A　g(-1)　(50.5%　retention).　In　addition,　the　asymmetric　supercapacitor　device　was　assembled　with　a　relatively　high　energy　density　of　88.2　Wh　Kg(-1)　at　a　power　density　of　162　W　Kg(-1).　The　device　had　a　high　capacity　retention　rate　of　95%　after　10000　cycles,　and　the　coulomb　efficiency　was　stable　at　99.7%,　showing　the　excellent　stability　of　the　composite.　Therefore,　the　MnO2@HPC-100　composite　has　great　application　prospects　in　energy　storage.