In　this　study,　NiS/ZnIn2S4　nanocomposites　were　successfully　prepared　via　a　facile　two-step　hydrothermal　process.　The　as-prepared　samples　were　characterized　by　X-ray　diffraction　(XRD),　X-ray　photoelectron　spectroscopy　(XPS),　transmission　electron　microscopy　(TEM)　and　high-resolution　transmission　electron　microscopy　(HRTEM).　Their　photocatalytic　performance　for　hydrogen　evolution　under　visible　light　irradiation　was　also　investigated.　It　was　found　that　the　photocatalytic　hydrogen　evolution　activity　over　hexagonal　ZnIn2S4　can　be　significantly　increased　by　loading　NiS　as　a　co-catalyst.　The　formation　of　a　good　junction　between　ZnIn2S4　and　NiS　via　the　two　step　hydrothermal　processes　is　beneficial　for　the　directional　migration　of　the　photo-excited　electrons　from　ZnIn2S4　to　NiS.　The　highest　photocatalytic　hydrogen　evolution　rate　(104.7　mu　mol/h),　which　is　even　higher　than　that　over　Pt/ZnIn2S4　nanocomposite　(77.8　mu　mol/h),　was　observed　over　an　optimum　NiS　loading　amount　of　0.5　wt　%.　This　work　demonstrates　a　high　potential　of　the　developing　of　environmental　friendly,　cheap　noble-metal-free　co-catalyst　for　semiconductor-based　photocatalytic　hydrogen　evolution.