Mesoporous　graphitic　carbon　nitride　(mpg-CN)　was　modified　with　cobalt　sulfide　(CoS)　by　using　an　impregnation-sulfidation　approach.　The　gas-phase　sulfidation　of　CoS　in　nanoporous　networks　at　certain　temperature　allows　for　the　formation　of　intimate　contact　between　the　host　carbon　nitride　and　CoS　nanoparticle,　establishing　noble-metal　free　heterojunctions　for　charge　separation　and　collection　at　material　interface.　The　resultant　CoS/mpg-CN　was　characterized　by　X-ray　diffraction　(XRD),　transmission　electron　microscopy　(TEM),　N2-sorption,　X-ray　photoelectron　spectroscopy　(XPS),　UV-Vis　diffuse　reflectance　spectroscopy,　photoluminescence　(PL)　spectroscopy　and　electrochemical　measurement.　On　the　basis　of　the　physicochemical　and　electrocatalytic　characterization　results　of　CoS/mpg-CN,　it　was　revealed　that　CoS　functioned　as　a　cocatalyst　to　promote　the　migration　of　excited　electron　from　mpg-CN　toward　CoS　as　well　as　to　provide　reactive　sites　for　H2　production　at　lower　overpotentials.　As　a　result,　the　rate　of　H2　evolution　over　mpg-CN　under　visible　light　illumination　(λ　>　420　nm)　was　significantly　improved　after　loading　with　CoS　and　the　optimal　loading　amount　of　CoS　was　found　to　be　1.0　at.　%.　Copyright　©　2014,　Hydrogen　Energy　Publications,　LLC.　Published　by　Elsevier　Ltd.　All　rights　reserved.