To　enhance　the　efficiency　of　photocatalytic　H-2　evolution,　numerous　methods　are　employed　by　increasing　the　utilization　of　photogenerated　charge　carriers　(PCCs),　including　catalyst　design,　defect　regulation,　and　selection　of　suitable　H+　resources.　Using　self　-assembly　method,　CoWO4/ZnxCd1-xS　with　p-n　heterojunction　was　synthesized.　Although　CoWO4　(CW)　cannot　produce　H-2　under　visible　light　irradiation,　it　can　provide　photogenerated　electrons　(e(-))　to　Zn0.3Cd0.7S　(ZCS),　and　largely　increase　the　photocatalytic　activity　of　ZCS.　The　optimal　CW/ZCS　composite　can　reach　15.58　mmol　center　dot　g(-1)center　dot　h(-1),　which　is　45.8　and　24.3　times　higher　than　the　values　of　the　pure　CdS　and　ZCS,　respectively.　The　largely　enhanced　photocatalytic　H-2　production　is　attributed　to　the　Zn　vacancies　(VZn),　p-n　heterojunction,　and　p-chlorobenzyl　alcohol　(Cl-PhCH2OH)　as　the　H+　source　of　H-2　production.　VZn　on　the　ZCS　surface　as　the　capture　center　of　photogenerated　holes　(h(+)),　can　regulate　the　carrier　distribution,　which　results　in　more　photogenerated　e(-)　and　less　generated　h(+).　The　combination　of　p-n　heterojunction　and　VZn　can　enhance　the　separation　and　transfer　efficiency　of　PCCs,　and　effectively　inhibit　the　recombination　of　charge　carriers.　To　further　improve　the　utilization　rate　of　PCCs,　the　photocatalytic　H-2　evolution　is　proceeded　by　Cl-PhCH2OH　oxidation　in　N,N-dimethylformamide　solution,　with　4-chlorobenzaldehyde　(Cl-PhCHO)　generated.　The　separated　photogenerated　e(-)　and　h(+)　both　participated　in　the　redox　reaction　of　H+　reduction　and　Cl-PhCH2OH　oxidation,　considering　that　the　amount　of　H-2　and　Cl-PhCHO　products　are　close　to　1:1.　This　work　not　only　facilitates　the　separation　and　transfer　of　PCCs,　but　also　provides　directions　for　the　design　of　efficient　photocatalysts　and　H-2　evolution　in　the　organic　phase.