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How to create the photo-excited hole-electron pair to proceed the surface chemical reactions is of significant importance for hydrogen production in water-splitting.In this paper,the dye-sensitized nanocrystalline TiO2 colloidal suspension in aqueous system is applied for H2 evolution under visible light (>390nm).In these suspension systems,the efficiency of H2 evolution is strongly influenced by the dye-sensitizers,a ruthenium complex (N719) and porphyline derivatives,and the combination with co-existing electron donor species,methanol (MeOH) and triethanolamine (TEOA).The analysis of fluorescence quenching and photoelectrochemical studies reveal that the combination of dye-sensitizes and co-existing species significantly dominates the electron transfer process.