Halogenated　organic　compounds　are　a　kind　of　common　environmentalpollutants.　Photocatalytic　dehalogenation　of　C-halogen　(C-X)bonds　to　C-H　bonds　can　not　only　control　environmental　pollutionbut　also　realize　important　organic　conversion　reactions.　However,the　electron　transfer　kinetics　of　photocatalytic　reduction　of　theC-X　bond　for　semiconductor/MOF　composites　has　remained　unexplored.Herein,　we　successfully　synthesized　CdS/Zn(impim)　(MOF)　dots-on-rodscomposite　photocatalyst　under　mild　conditions.　Zn(impim)　MOF　consistsof　Zn(&　mu;-N)(4)　clusters　and　imidazole　derivative　ligands.Zn(impim),　as　a　carrier,　is　beneficial　to　the　dispersion　of　CdS　nanoparticlesand　avoiding　the　agglomeration　of　CdS　nanoparticles.　The　photocatalyticperformance　of　CdS/Zn(impim)　composites　for　the　reduction　of　the　C-Xbond　is　much　higher　than　that　of　pure　CdS　or　Zn(impim).　This　highactivity　is　due　to　the　high　electron　separation　efficiency　of　CdSassisted　by　Zn(impim).　Under　visible　light　irradiation,　Zn(impim)is　not　excited　due　to　its　wide　band　gap　of　3.26　eV.　Through　metal-to-ligandcharge　transfer　of　Zn(&　mu;-N)(4)　clusters,　Zn(impim)　acceptsexcited　electrons　from　CdS　because　the　Fermi　energy　level　of　CdS　ismore　negative　by　Kelvin　probe　force　microscopy.　Moreover,　fluorescencespectrum　and　femtosecond　transient　absorption　spectroscopy　revealthe　related　electron　transfer　kinetics　in　detail.　In　addition,　theinherent　porous　structure　of　MOFs　is　beneficial　to　the　adsorptionof　halogenated　hydrocarbons,　providing　a　suitable　environment　forthe　dehalogenation　reaction,　thus　improving　the　activity.　This　workcan　further　understand　the　electron　transfer　mechanism　in　semiconductor/MOFcomposites　for　photocatalytic　halide　dehalogenation.