For　achieving　the　goal　of　peaking　carbon　dioxide　emissions　and　achieving　carbon　neutrality,　developing　hydrogen　energy,　the　green　and　clean　energy,　shows　a　promising　perspective　for　solving　the　energy　and　ecological　issues.　Herein,　firstly,　we　used　the　hydrothermal　method　to　synthesize　the　ZnS(en)0.5　as　the　precursor.　Then,　ZnS/ZnO　composite　was　obtained　by　the　in　situ　transformation　of　ZnS(en)0.5　with　heat　treatment　under　air　atmosphere.　The　composition,　optical　property,　morphology,　and　structural　properties　of　the　composite　were　characterized　by　X-ray　photoemission　spectroscopy　(XPS),　Ultraviolet-visible　absorption　spectra　(Uv-vis　Abs),　Scanning　electron　microscopy　(SEM)　and　Transmission　electron　microscopy　image　(TEM).　Moreover,　the　content　of　ZnO　in　ZnS/ZnO　was　controlled　via　adjustment　of　the　calcination　times.　The　visible-light　response　of　ZnS/ZnO　originated　from　the　in　situ　doping　of　N　during　the　transformation　of　ZnS(en)0.5　to　ZnS/ZnO　under　heat　treatment,　which　was　verified　well　by　XPS.　Photocatalytic　hydrogen　evolution　experiments　demonstrated　that　the　sample　of　ZnS/ZnO-0.5　h　with　6.9　wt%　of　ZnO　had　the　best　H2　evolution　activity　(1790　μmol/h/g)　under　visible　light　irradiation　(λ　>　400　nm),　about　7.0　and　12.3　times　that　of　the　pure　ZnS　and　ZnO,　respectively.　The　enhanced　activities　of　the　ZnS/ZnO　composites　were　ascribed　to　the　intimated　hetero-interface　between　components　and　efficient　transfer　of　photo-generated　electrons　from　ZnS　to　ZnO.　©　2022　by　the　authors.