Sodium-ion　batteries　(SIBs)　are　considered　as　a　promising　candidate　to　lithium-ion　batteries　(LIBs)　owing　to　the　inexpensive　and　abundant　sodium　reserves.　However,　the　application　of　anode　materials　for　SIBs　still　confront　rapid　capacity　fading　and　undesirable　rate　capability.　Here　we　simultaneously　grow　ultrafine　ZnSe　nanoparticles　on　the　inner　walls　and　the　outer　surface　of　hollow　carbon　nanospheres　(ZnSe@HCNs),　giving　a　unique　hierarchical　hybrid　nanostructure　that　can　sustain　a　capacity　of　361.9　mAh　g(-1)　at　1　A　g(-1)　over　1000　cycles　and　266.5　mAh　g(-1)　at　20　A　g(-1).　Our　investigations　indicate　that　the　sodium　storage　mechanism　of　ZnSe@HCNs　electrodes　is　a　mixture　of　alloying　and　conversion　reactions,　where　ZnSe　converts　to　Na2Se　and　NaZn13　through　a　series　of　intermediate　compounds.　Also,　a　full　cell　is　constructed　from　our　designed　ZnSe@HCNs　anode　and　Na3V2(PO4)(3)　cathode.　It　delivers　a　reversible　discharge　capacity　of　about　313.1　mAh　g(-1)　after　100　cycles　at　0.5　A　g(-1)　with　high　Columbic　efficiency　over　98.2%.　The　outstanding　sodium　storage　of　as-prepared　ZnSe@HCNs　is　attributed　to　the　confinement　of　ZnSe　structural　changes　both　inside/outside　of　hollow　nanospheres　during　the　sodiation/desodiation　processes.　Our　work　offers　a　promising　design　to　enable　high-power-density　electrodes　for　the　various　battery　systems.