Branched　hierarchical　CdS/ZnO　nanocomposites　have　been　synthesized　for　application　toward　photocatalytic　fine-chemical　synthesis.　Growing　ZnO　nanorods　on　the　surface　of　CdS　nanowires　boosts　the　light　harvesting　efficiency　and　charge　separation　as　well　as　fast　charge　transport　and　collection.　A　Z-scheme　mechanism　under　artificial　solar　light　is　also　proposed.