A　novel　ternary　Z-scheme　system　of　WO3@MoS2/CdS　is　successfully　constructed　using　a　three-step　wet-chemical　route,　where　MoS2　locates　between　the　rod-shaped　WO3　and　CdS　nanoparticles　and　simultaneously　plays　multiple　roles　of　the　charge　transfer　mode　switcher,　electron-hole　mediator　and　cocatalyst.　As　a　charge　transfer　mode　switcher,　MoS2　can　transform　the　conventional　type-II　charge　transfer　mode　to　Z-scheme.　In　such　a　Zscheme　system,　as　an　electron-hole　mediator,　MoS2　is　applied　to　quench　the　energy　of　the　electrons　from　WO3　and　the　holes　from　CdS　in　shorten　length,　and　thus　the　more　left　electrons　from　CdS　can　transfer　to　MoS2,　which　can　be　further　applied　to　photocatalytic　evolution　H-2　owing　to　the　cocatalyst　role　of　MoS2.　Benefitting　from　the　multifunctional　roles　of　MoS2,　such　a　Z-scheme　system　of　WO3@MoS2/CdS　shows　an　enhanced　photocatalytic　performance.