Zinc　molybdate　(ZnMoO4),　a　layer　perovskite　material,　has　the　advantages　of　high　stability,　excellent　optical　and　charge　properties.　However,　its　high　band　gap　and　high　electron-hole　recombination　efficiency　limit　its　application　in　the　photocatalytic　reduction　field　like　hydrogen　production.　In　this　study,　we　used　CdS　as　a　co-catalyst　and　successfully　prepared　CdS/ZnMoO4　composite　photocatalysts　with　different　loadings.　The　hydrogen　evolution　rate　of　CdS/ZnMoO4　reached　530.2　mu　mol　h(-1)　g(-1),　which　was　approximately　11　and　100　times　more　than　rates　of　pure　CdS　and　ZnMoO4　under　the　same　conditions,　respectively.　It　is　the　presence　of　CdS　that　contributed　to　this　improved　performance,　which　acted　as　an　electron　acceptor　to　separate　electrons　and　holes.　Besides,　a　reasonable　mechanism　was　provided　based　on　photoelectrochemical　characterizations.　CdS　loading　greatly　improved　the　hydrogen　evolution　performance　of　ZnMoO4　under　visible　light,　providing　a　direction　to　improving　the　performance　of　perovskite　based　photocatalysts.