In　this　paper,　we　report　a　vertical　self-assembly　of　ultrathin　CdIn2S4　nanosheet　arrays　on　the　conductive　substrate　of　the　reduced　graphene　oxide　(rGO)　by　the　facile　hydrothermal　process,　during　which　ZnS　quantum　dots　(QDs)　were　in-situ　deposited　on　the　gap　of　CdIn2S4　nanosheet　arrays　to　form　the　intimate　interfacial　contact　between　ZnS/CdIn2S4　and　rGO.　The　unique　structural　configuration　of　this　well-ordered　three-dimensional　(3D)　ZnS/CdIn2S4/rGO　nanosheet　arrays　were　very　beneficial　for　the　visible-light　absorption,　thus　strongly　improving　the　light-harvesting.　Moreover,　the　as-prepared　3D　nanosheet　arrays　architecture　with　the　GO　content　of　13　wt%　exhibited　the　highest　photocurrent　transient　response　(107.4　mu　A　cm(-2)),　which　corresponding　to　the　highest　hydrogen　generation　of　6.82　mmol　g(-1)　h(-1)　and　a　relatively　high　apparent　quantum　efficiency　of　19.34%　under　visible　light　irradiation.　The　enhanced　photocatalytic　hydrogen　production　activities　can　be　attribute　to　the　synergistic　effects　of　the　favorable　light　trapping　ability,　more　exposed　activity　sites　and　efficient　spatial　charge　separation　as　well　as　faster　electron　transfer　between　ZnS　QDs　and　CdIn2S4　nanosheet　arrays　through　the　conductive　network　of　rGO.　This　work　presents　a　new　strategy　to　reasonably　design　and　fabricate　the　next　generation　ultrathin　nanosheet　arrays　architecture　for　practical　applications　in　efficient　photocatalytic　water　splitting.