Designing　a　semiconductor　CdS-based　photo　catalyst　for　H-2　evolution　from　water　with　high　activity　and　stability　is　extremely　desirable　for　practical　application.　We　report　the　important　morphological　and　structural　influence　of　MoS2　cocatalyst　on　the　photocorrosion　and　photoactivity　of　CdS　that　is　carpeted　on　a　graphene　(GR)　surface.　Homogeneous　dispersion　of　MoS2　nanopartides　by　a　controlled　photodeposition　(PD)　method　produces　the　GR-CdS-MoS2　(PD)　composite,　which　does　not　have　the　characteristic　stacked　layer　structure　of　MoS2.　However,　this　GR-CdS-MoS2　(PD)　composite　exhibits　much　higher　activity　and　particularly　antiphotocorrosion　than　the　hydrothermal　synthesized　GR-CdS-MoS2　(HT)　counterparts,　which　feature　the　characteristic　MoS2　layer　structure,　toward　photocatalytic　water　splitting　under　visible　light　irradiation.　The　characterization　results　indicate　that　homogeneous　dispersion　of　tiny　MoS2　for　GR-CdS-MoS2　(PD)　markedly　improves　the　separation　and　transfer　of　charge　carriers　and　provides　the　increased　number　of　catalytic　active　sites　afforded　by　the　absence　of　the　stacked　layer　structure　of　the　MoS2　cocatalyst.　This　work　provides　direct　evidence　of　the　negative　effect　of　the　stacked　layer　structure　of　MoS2　on　boosting　the　activity　and　photostability　of　CdS　on　the　GR　surface,　which　would　guide　the　more　rational　use　of　MoS2　and　GR　as　cocatalyst　toward　achieving　a　highly　active　and　stable　semiconductor-based　composite　photocatalyst　for　H-2　evolution.