Photocatalytic　water　splitting　for　hydrogen　evolution　as　an　attractive　strategy　for　developing　sustainable　energy　by　utilizing　sunlight　has　attracted　enormous　research　efforts.　Cadmium　sulfide　(CdS)　with　visible　light　response　and　proper　energy　band　structure　has　been　studied　intensively.　To　suppress　the　recombination　of　charge　carriers　and　facilitate　the　hydrogen　evolution　reaction　(HER)　over　CdS,　electrically　conductive　graphene　and　active-site-abundant　MoS2　have　proven　to　be　efficient　dual　cocatalysts　to　improve　the　photocatalytic　HER　performance　of　CdS.　In　this　review,　we　will　focus　on　the　representative　ternary　composite　photocatalysts　of　CdS-graphene-MoS2.　The　synthesis　approaches　are　first　summarized,　followed　by　the　discussion　of　the　roles　of　each　component　in　the　composites.　Then　main　attention　will　be　paid　to　highlighting　the　effects　of　the　microscopic　structures　of　the　components　on　the　photocatalytic　performance　of　the　composites　for　HER　applications.　It　is　expected　that　this　review　could　be　helpful　to　the　rational　design　and　further　optimization　of　semiconductor-based　composite　photocatalysts　through　materials　engineering　strategies　for　solar　energy　conversion.　©　2018　IUPAC　&　De　Gruyter.