Zinc　selenide　(ZnSe)　is　a　next-generation　anode　material　due　to　its　high　sodium　storage　capacity.　However,　the　poor　conductivity　and　volume　expansion　lead　to　its　capacity　attenuation　and　short　cycle　life.　Herein,　Se-vacancy　porous　ultrathin　ZnSe　nanosheet/carbon　composite　(ZnSe@NC/N-GQD)　is　reported　as　a　high-performance　anode　material　for　sodium-ion　batteries.　Organic-inorganic　hybrid　ZnSe(en)0.5　ultrathin　nanosheets　with　abundant　Se　vacancies　are　rapidly　prepared　by　electron　beam　irradiation　for　the　first　time.　Using　it　as　a　precursor,　Se-vacancy　carbon-coated　porous　ultrathin　ZnSe　nanosheets　loaded　with　nitrogen-doped　graphene　quantum　dots　(N-GQDs)　are　synthesized　via　carbonization　and　electrodeposition　process.　Through　the　design　of　ZnSe@NC/N-GQD,　the　sodium　storage　performance　can　be　effectively　improved　by　implementing　nanostructure　engineering　(porous　ultrathin　nanosheet)　via　organic-inorganic　hybrid,　defect　engineering　(Se　vacancy)　via　electron　beam　irradiation,　and　carbon　composite　(amorphous　carbon　and　N-GQD).　Consequently,　ZnSe@NC/N-GQD　delivers　a　high　capacity　of　483　mA　h　g-　1　after　200　cycles　at　0.5　A　g-　1,　shows　an　outstanding　rate　capability　of　381　mA　h　g-　1　at　10.0　A　g-　1,　and　exhibits　an　excellent　cycling　stability　of　86　%　retention　after　2800　cycles　at　5.0　A　g-1.　This　work　develops　a　new　method　to　rapidly　prepare　organic-inorganic　nanohybrids,　and　proposes　an　innovative　design　of　high-performance　ZnSe-based　anodes.