Carbon　dots　(Cdots)　with　a　broad　light　absorption　range　could　be　a　potential　stable　sensitizer　for　TiO2,　which　is　an　excellent　ultraviolet　(UV)　response　photocatalyst.　Herein,　we　systematically　investigated　the　different　color　emissive　Cdots-sensitized　TiO2　for　H-2　production.　Firstly,　all　kinds　of　Cdots　enhanced　the　photocatalytic　properties　of　TiO2.　All　the　Cdots-sensitized　TiO2　exhibits　visible　light　H-2　production　due　to　their　absorption　in　the　visible　light　region.　The　photocurrent　and　H-2　production　amount　display　strong　dependence　on　the　light　absorption　range　of　Cdots.　The　blue-emissive　Cdots　endow　the　weak　H-2　production　rate　due　to　its　weak　absorption　in　the　visible　light.　The　enhanced　photocatalytic　activities　are　mainly　contributed　to　the　strong　light　absorbance　and　high-efficient　charge　separation.　The　light　absorption　of　green-　and　red-emissive　Cdots　is　another　main　factor　for　the　high　catalytic　activities　besides　charge　separation.