Sodium-ion　batteries　(SIBs)　have　been　intensively　researched　as　potential　alternative　energy　storage　devices　to　lithium-ion　batteries　(LIBs).　Nevertheless,　the　scarcity　of　suitable　anode　materials　capable　of　hosting　the　large　radius　of　Na+　has　hindered　the　further　application　of　SIBs.　Herein,　we　developed　a　hierarchical　VS4　nanosheet　with　an　expanded　interchain　spacing　of　0.98　nm　without　additives　for　the　first　time.　Additionally,　we　found　that　the　porous　structure　in　the　hierarchical　VS4　nanosheet　provides　sufficient　active　sites　for　Na+　storage　and　alleviates　the　volume　variation　during　discharge/charge　cycles,　as　supported　by　finite　element　simulation　(FES)　data.　More　importantly,　a　dynamic　insertion-dominated　storage　mechanism　was　revealed　through　synchrotron　X-ray　absorption　spectroscopy　and　X-ray　photoelectron　spectroscopy.　Thus,　the　optimized　anode　delivered　a　high　capacity　of　441　mAh　g-1　at　1　A　g-1　after　200　cycles.　This　work　provides　critical　insights　into　the　design　of　SIBs　by　correlating　storage　mechanisms　with　electrode＇s　structural　composition.