An　available　approach　to　ameliorate　the　property　of　electrocatalysts　for　transition　metal　selenides　(TMSs)　is　to　transform　their　structure,　morphology,　and　elemental　composition,　especially　for　hydrogen　evolution　reactions　(HER),　which　can　be　a　long-term　task.　In　this　work,　Ni-Co　nanospheres　were　synthesized　by　a　hydrothermal　method,　and　then　in　the　synchronous　processes　of　selenization　and　carbonization,　it　reacted　with　the　peripherally　coated　melamine-copper　complex,　which　was　the　reactant　between　melamine　and　copper　ions.　Ultimately,　CoSe　2　/NiSe　2　@Cu　2　Se-NC　nanospheres　with　a　core-shell　structure　were　synthesized　after　annealing　process.　This　special　structure　provided　more　active　attachment　sites,　enabling　CoSe　2　/NiSe　2　@Cu　2　Se-NC　to　exhibit　excellent　HER　properties　under　wide-pH　range.　Especially,　in　acidic　conditions,　it　had　a　low　initial　potential　of　41.0　mV,　a　small　Tafel　slope　value　of　48.7　mV　dec　-　1　,　and　a　long　service　life.　The　proposed　scheme　indicates　that　a　new　approach　will　be　added　to　the　synthesis　of　electrocatalysts　based　on　TMSs.